fsnotify: create helper fsnotify_inode()

Simple helper to consolidate biolerplate code.

Link: https://lore.kernel.org/r/20200722125849.17418-5-amir73il@gmail.com
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>

fs/kernfs/file.c

@@ -910,10 +910,8 @@ repeat:
 			kernfs_put(parent);
 		}
 
-		if (!p_inode) {
-			fsnotify(inode, FS_MODIFY, inode, FSNOTIFY_EVENT_INODE,
-				 NULL, 0);
-		}
+		if (!p_inode)
+			fsnotify_inode(inode, FS_MODIFY);
 
 		iput(inode);
 	}