util: storage: fill in default ports when parsing backing chain

Similarly to when parsing XML we need to fill in default ports for the
backing chain. This was missed in commit 5bda8354

src/util/virstoragefile.c

@@ -3340,6 +3340,9 @@ virStorageSourceNewFromBackingAbsolute(const char *path)
 
         if (rc < 0)
             goto error;
+
+        if (virStorageSourceNetworkAssignDefaultPorts(ret) < 0)
+            goto error;
     }
 
     return ret;

tests/virstoragetest.c

@@ -1349,7 +1349,7 @@ mymain(void)
     TEST_BACKING_PARSE("://", NULL);
     TEST_BACKING_PARSE("http://example.com/file",
                        "<source protocol='http' name='file'>\n"
-                       "  <host name='example.com'/>\n"
+                       "  <host name='example.com' port='80'/>\n"
                        "</source>\n");
     TEST_BACKING_PARSE("rbd:testshare:id=asdf:mon_host=example.com",
                        "<source protocol='rbd' name='testshare'>\n"
@@ -1385,14 +1385,14 @@ mymain(void)
     TEST_BACKING_PARSE("json:{\"file.driver\":\"http\", "
                              "\"file.url\":\"http://example.com/file\"}",
                        "<source protocol='http' name='file'>\n"
-                       "  <host name='example.com'/>\n"
+                       "  <host name='example.com' port='80'/>\n"
                        "</source>\n");
     TEST_BACKING_PARSE("json:{\"file\":{ \"driver\":\"http\","
                                         "\"url\":\"http://example.com/file\""
                                       "}"
                             "}",
                        "<source protocol='http' name='file'>\n"
-                       "  <host name='example.com'/>\n"
+                       "  <host name='example.com' port='80'/>\n"
                        "</source>\n");
     TEST_BACKING_PARSE("json:{\"file.driver\":\"ftp\", "
                              "\"file.url\":\"http://example.com/file\"}",
@@ -1400,7 +1400,7 @@ mymain(void)
     TEST_BACKING_PARSE("json:{\"file.driver\":\"gluster\", "
                              "\"file.filename\":\"gluster://example.com/vol/file\"}",
                        "<source protocol='gluster' name='vol/file'>\n"
-                       "  <host name='example.com'/>\n"
+                       "  <host name='example.com' port='24007'/>\n"
                        "</source>\n");
     TEST_BACKING_PARSE("json:{\"file\":{\"driver\":\"gluster\","
                                        "\"volume\":\"testvol\","
@@ -1421,7 +1421,7 @@ mymain(void)
                         "<source protocol='gluster' name='testvol/img.qcow2'>\n"
                         "  <host name='example.com' port='1234'/>\n"
                         "  <host transport='unix' socket='/path/socket'/>\n"
-                        "  <host name='example.com'/>\n"
+                        "  <host name='example.com' port='24007'/>\n"
                         "</source>\n");
     TEST_BACKING_PARSE("json:{\"file.driver\":\"gluster\","
                              "\"file.volume\":\"testvol\","
@@ -1441,7 +1441,7 @@ mymain(void)
                         "<source protocol='gluster' name='testvol/img.qcow2'>\n"
                         "  <host name='example.com' port='1234'/>\n"
                         "  <host transport='unix' socket='/path/socket'/>\n"
-                        "  <host name='example.com'/>\n"
+                        "  <host name='example.com' port='24007'/>\n"
                         "</source>\n");
     TEST_BACKING_PARSE("json:{\"file\":{\"driver\":\"nbd\","
                                        "\"path\":\"/path/to/socket\""
@@ -1552,7 +1552,7 @@ mymain(void)
                                       "}"
                             "}",
                        "<source protocol='iscsi' name='iqn.2016-12.com.virttest:emulated-iscsi-noauth.target/0'>\n"
-                       "  <host name='test.org'/>\n"
+                       "  <host name='test.org' port='3260'/>\n"
                        "</source>\n");
     TEST_BACKING_PARSE("json:{\"file\":{\"driver\":\"iscsi\","
                                        "\"transport\":\"tcp\","