freevxfs: Grammar s/an negative/a negative/

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Jiri Kosina <jkosina@suse.com>

fs/freevxfs/vxfs_lookup.c

@@ -192,7 +192,7 @@ vxfs_inode_by_name(struct inode *dip, struct dentry *dp)
  *   by @dp in @dip.
  *
  * Returns:
- *   A NULL-pointer on success, else an negative error code encoded
+ *   A NULL-pointer on success, else a negative error code encoded
  *   in the return pointer.
  */
 static struct dentry *