nilfs2: avoid bare use of 'unsigned'

This fixes checkpatch.pl warning "WARNING: Prefer 'unsigned int' to
bare use of 'unsigned'".

Link: http://lkml.kernel.org/r/1462886671-3521-5-git-send-email-konishi.ryusuke@lab.ntt.co.jp
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/nilfs2/page.c b/fs/nilfs2/page.c
index 1968713..d97ba5f 100644
--- a/fs/nilfs2/page.c
+++ b/fs/nilfs2/page.c
@@ -435,12 +435,12 @@
 	__nilfs_clear_page_dirty(page);
 }
 
-unsigned nilfs_page_count_clean_buffers(struct page *page,
-					unsigned from, unsigned to)
+unsigned int nilfs_page_count_clean_buffers(struct page *page,
+					    unsigned int from, unsigned int to)
 {
-	unsigned block_start, block_end;
+	unsigned int block_start, block_end;
 	struct buffer_head *bh, *head;
-	unsigned nc = 0;
+	unsigned int nc = 0;
 
 	for (bh = head = page_buffers(page), block_start = 0;
 	     bh != head || !block_start;