storage: prevent unitialized variable warning

src/lxc/storage/btrfs.c

@@ -41,6 +41,7 @@
 #include "btrfs.h"
 #include "config.h"
 #include "log.h"
+#include "memory_utils.h"
 #include "rsync.h"
 #include "storage.h"
 #include "utils.h"
@@ -763,7 +764,6 @@ static int btrfs_recursive_destroy(const char *path)
 	int ret, e, i;
 	unsigned long off = 0;
 	u16 name_len;
-	char *tmppath;
 	u64 dir_id;
 
 	fd = open(path, O_RDONLY);
@@ -834,7 +834,8 @@ static int btrfs_recursive_destroy(const char *path)
 			 * name of the child subvol in question.
 			 */
 			if (sh.objectid != root_id && sh.type == BTRFS_ROOT_BACKREF_KEY) {
-				char *name, *tmp;
+				__do_free char *name = NULL, *tmppath = NULL;
+				char *tmp;
 
 				ref = (struct btrfs_root_ref *)(args.buf + off);
 				name_len = btrfs_stack_root_ref_name_len(ref);
@@ -844,7 +845,6 @@ static int btrfs_recursive_destroy(const char *path)
 				if (!name) {
 					ERROR("Out of memory");
 					free_btrfs_tree(tree);
-					free(tmppath);
 					close(fd);
 				}
 
@@ -859,14 +859,9 @@ static int btrfs_recursive_destroy(const char *path)
 							name_len, tmppath)) {
 					ERROR("Out of memory");
 					free_btrfs_tree(tree);
-					free(name);
-					free(tmppath);
 					close(fd);
 					return -1;
 				}
-
-				free(tmppath);
-				free(name);
 			}
 
 			off += sh.len;