migration/block-dirty-bitmap: fix uninitialized variable warning

A default value is provided for the variable 'bitmap_name' to avoid
a compiler warning.

The compiler showed the warning:
migration/block-dirty-bitmap.c:1090:13: warning: ‘bitmap_name’
may be used uninitialized in this function [-Wmaybe-uninitialized]
       g_strlcpy(s->bitmap_name, bitmap_name, sizeof(s->bitmap_name));
       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Reported-by: Euler Robot <euler.robot@huawei.com>
Signed-off-by: Chen Qun <kuhn.chenqun@huawei.com>
Message-Id: <20201014114430.1898684-1-kuhn.chenqun@huawei.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
[eblake: commit message grammar tweaks]
Signed-off-by: Eric Blake <eblake@redhat.com>

1 files changed, 9 insertions, 12 deletions

diff --git a/migration/block-dirty-bitmap.c b/migration/block-dirty-bitmap.c
index 98921db772..c61d382be8 100644
--- a/migration/block-dirty-bitmap.c
+++ b/migration/block-dirty-bitmap.c
@@ -1072,18 +1072,15 @@ static int dirty_bitmap_load_header(QEMUFile *f, DBMLoadState *s,
             return -EINVAL;
         }
 
-        if (!s->cancelled) {
-            if (bitmap_alias_map) {
-                bitmap_name = g_hash_table_lookup(bitmap_alias_map,
-                                                  s->bitmap_alias);
-                if (!bitmap_name) {
-                    error_report("Error: Unknown bitmap alias '%s' on node "
-                                 "'%s' (alias '%s')", s->bitmap_alias,
-                                 s->bs->node_name, s->node_alias);
-                    cancel_incoming_locked(s);
-                }
-            } else {
-                bitmap_name = s->bitmap_alias;
+        bitmap_name = s->bitmap_alias;
+        if (!s->cancelled && bitmap_alias_map) {
+            bitmap_name = g_hash_table_lookup(bitmap_alias_map,
+                                              s->bitmap_alias);
+            if (!bitmap_name) {
+                error_report("Error: Unknown bitmap alias '%s' on node "
+                             "'%s' (alias '%s')", s->bitmap_alias,
+                             s->bs->node_name, s->node_alias);
+                cancel_incoming_locked(s);
             }
         }