f2fs: fix a typo in inode.c

Do a trivial typo fix.
s/runing/running

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Ruiqi Gong <gongruiqi1@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/inode.c

@@ -698,7 +698,7 @@ int f2fs_write_inode(struct inode *inode, struct writeback_control *wbc)
 
 	/*
 	 * We need to balance fs here to prevent from producing dirty node pages
-	 * during the urgent cleaning time when runing out of free sections.
+	 * during the urgent cleaning time when running out of free sections.
 	 */
 	f2fs_update_inode_page(inode);
 	if (wbc && wbc->nr_to_write)