ext4: update comments regarding ext4_delete_inode()

ext4_delete_inode() has been renamed for a long time, update
comments for this.

Signed-off-by: Wang Shilong <wshilong@ddn.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index b416b46..5653fa4 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3620,7 +3620,7 @@
 	 * If this was a simple ftruncate() and the file will remain alive,
 	 * then we need to clear up the orphan record which we created above.
 	 * However, if this was a real unlink then we were called by
-	 * ext4_delete_inode(), and we allow that function to clean up the
+	 * ext4_evict_inode(), and we allow that function to clean up the
 	 * orphan info for us.
 	 */
 	if (inode->i_nlink)