vmdk: share cleanup code

cleanup code is identical for error/success cases.  Only difference
are goto labels.
Signed-off-by: NJuan Quintela <quintela@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

block/vmdk.c

@@ -334,18 +334,13 @@ static int vmdk_snapshot_create(const char *filename, const char *backing_file)
         ret = -errno;
         goto fail_gd;
     }
-    qemu_free(gd_buf);
-    qemu_free(rgd_buf);
-
-    close(p_fd);
-    close(snp_fd);
-    return 0;
+    ret = 0;
 
-    fail_gd:
+fail_gd:
     qemu_free(gd_buf);
-    fail_rgd:
+fail_rgd:
     qemu_free(rgd_buf);
-    fail:
+fail:
     close(p_fd);
     close(snp_fd);
     return ret;