ovl: fix misspellings using codespell tool

A typo is found out by codespell tool:

$ codespell ./fs/overlayfs/
./fs/overlayfs/util.c:217: dependig  ==> depending

Fix a typo found by codespell.

Signed-off-by: Xiong Zhenwu <xiong.zhenwu@zte.com.cn>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

fs/overlayfs/util.c

@@ -214,7 +214,7 @@ const struct ovl_layer *ovl_layer_lower(struct dentry *dentry)
 
 /*
  * ovl_dentry_lower() could return either a data dentry or metacopy dentry
- * dependig on what is stored in lowerstack[0]. At times we need to find
+ * depending on what is stored in lowerstack[0]. At times we need to find
  * lower dentry which has data (and not metacopy dentry). This helper
  * returns the lower data dentry.
  */