virnetdev: fix moving of 802.11 phys

There was a couple of problems with the style fixes applied to the original
patch:

1.) virFileReadAllQuiet comparison was incorrectly parenthesized when moved
into a condition, causing the len to be set to the result of comparison. This,
together with the removed underflow check would underflow the phy buffer.

2.) The logic was broken. Failure to call "ip" would abort the function, thus
the "iw" branch would never be reached.

This aims to fix the issues and work around possible style complains :)
Signed-off-by: NLubomir Rintel <lkundrak@v3.sk>
(cherry picked from commit 81b19ce4)

src/util/virnetdev.c

@@ -557,40 +557,36 @@ int virNetDevSetNamespace(const char *ifname, pid_t pidInNs)
     char *phy_path = NULL;
     int len;
 
-    const char *argv[] = {
-        "ip", "link", "set", ifname, "netns", NULL, NULL
-    };
-
-    const char *iwargv[] = {
-        "iw", "phy", NULL, "set", "netns", NULL, NULL
-    };
-
     if (virAsprintf(&pid, "%lld", (long long) pidInNs) == -1)
         return -1;
 
-    argv[5] = pid;
-    if (virRun(argv, NULL) < 0)
-        goto cleanup;
-
     /* The 802.11 wireless devices only move together with their PHY. */
     if (virNetDevSysfsFile(&phy_path, ifname, "phy80211/name") < 0)
         goto cleanup;
 
-    if ((len = virFileReadAllQuiet(phy_path, 1024, &phy) < 0)) {
-        if (errno == ENOENT) {
-            /* Okay, this is not a wireless card. Claim success. */
-            ret = 0;
-        }
-        goto cleanup;
-    }
+    if ((len = virFileReadAllQuiet(phy_path, 1024, &phy)) <= 0) {
+        /* Not a wireless device. */
+        const char *argv[] = {
+            "ip", "link", "set", ifname, "netns", NULL, NULL
+        };
 
-    /* Remove a line break. */
-    phy[len - 1] = '\0';
+        argv[5] = pid;
+        if (virRun(argv, NULL) < 0)
+            goto cleanup;
 
-    iwargv[2] = phy;
-    iwargv[5] = pid;
-    if (virRun(iwargv, NULL) < 0)
-        goto cleanup;
+    } else {
+        const char *argv[] = {
+            "iw", "phy", NULL, "set", "netns", NULL, NULL
+        };
+
+        /* Remove a line break. */
+        phy[len - 1] = '\0';
+
+        argv[2] = phy;
+        argv[5] = pid;
+        if (virRun(argv, NULL) < 0)
+            goto cleanup;
+    }
 
     ret = 0;
  cleanup: