ext4: fix use of potentially uninitialized variables in debugging code

If ext_debugging is enabled and path[depth].p_ext is NULL, len
and lblock are printed non initialized
Signed-off-by: NAndi Shyti <andi@etezian.org>
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>

fs/ext4/extents.c

@@ -2285,8 +2285,8 @@ ext4_ext_put_gap_in_cache(struct inode *inode, struct ext4_ext_path *path,
 				ext4_lblk_t block)
 {
 	int depth = ext_depth(inode);
-	unsigned long len;
-	ext4_lblk_t lblock;
+	unsigned long len = 0;
+	ext4_lblk_t lblock = 0;
 	struct ext4_extent *ex;
 
 	ex = path[depth].p_ext;
@@ -2323,7 +2323,6 @@ ext4_ext_put_gap_in_cache(struct inode *inode, struct ext4_ext_path *path,
 			ext4_es_insert_extent(inode, lblock, len, ~0,
 					      EXTENT_STATUS_HOLE);
 	} else {
-		lblock = len = 0;
 		BUG();
 	}