btrfs-progs: Init root_item to avoid gcc 4.8.2 warning

When using gcc 4.8.2, -Wmaybe-uninitialized will report root_item may be
used uninitialized.
Since root_item_valid variant is used to determine the root_item valid,
it's a false alert and to avoid the warning, just init it on allocation.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>

diff --git a/send-utils.c b/send-utils.c
index 8d4f46e..71b6ec1 100644 (file)
--- a/send-utils.c
+++ b/send-utils.c
@@ -538,7 +538,7 @@ int subvol_uuid_search_init(int mnt_fd, struct subvol_uuid_search *s)
        struct btrfs_ioctl_search_key *sk = &args.key;
        struct btrfs_ioctl_search_header *sh;
        struct btrfs_root_item *root_item_ptr;
-       struct btrfs_root_item root_item;
+       struct btrfs_root_item root_item = {};
        struct subvol_info *si = NULL;
        int root_item_valid = 0;
        unsigned long off = 0;