staging: erofs: change 'unsigned' to 'unsigned int'

Fix coding style issue "Prefer 'unsigned int' to bare use of 'unsigned'"
detected by checkpatch.pl
Signed-off-by: NLeon Imhof <leon.imhof@in.tum.de>
Reviewed-by: NGao Xiang <gaoxiang25@huawei.com>
Reviewed-by: NChao Yu <yuchao0@huawei.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/erofs/data.c

@@ -363,7 +363,7 @@ static int erofs_raw_access_readpage(struct file *file, struct page *page)
 
 static int erofs_raw_access_readpages(struct file *filp,
 	struct address_space *mapping,
-	struct list_head *pages, unsigned nr_pages)
+	struct list_head *pages, unsigned int nr_pages)
 {
 	erofs_off_t last_block;
 	struct bio *bio = NULL;