qemu-img: fix img_compare() flags error path

If img_compare() fails to parse the cache flags the goto out3 code path
will call qemu_progress_end().  Make sure we actually call
qemu_progress_init() first.
Reported-by: NMarkus Armbruster <armbru@redhat.com>
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: NMax Reitz <mreitz@redhat.com>

qemu-img.c

@@ -999,6 +999,9 @@ static int img_compare(int argc, char **argv)
     filename1 = argv[optind++];
     filename2 = argv[optind++];
 
+    /* Initialize before goto out */
+    qemu_progress_init(progress, 2.0);
+
     flags = BDRV_O_FLAGS;
     ret = bdrv_parse_cache_flags(cache, &flags);
     if (ret < 0) {
@@ -1007,9 +1010,6 @@ static int img_compare(int argc, char **argv)
         goto out3;
     }
 
-    /* Initialize before goto out */
-    qemu_progress_init(progress, 2.0);
-
     bs1 = bdrv_new_open("image 1", filename1, fmt1, flags, true, quiet);
     if (!bs1) {
         error_report("Can't open file %s", filename1);