f2fs: use find_get_pages_tag() for looking up single page

__get_first_dirty_index() wants to lookup only the first dirty page
after given index.  There's no point in using pagevec_lookup_tag() for
that.  Just use find_get_pages_tag() directly.

Link: http://lkml.kernel.org/r/20171009151359.31984-8-jack@suse.cz
Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Reviewed-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Cc: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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