fs: f2fs: changed variable type of offset "unsigned" to "loff_t"

clean up checkpatch warning:
WARNING: Prefer 'unsigned int' to bare use of 'unsigned'
Signed-off-by: Nyoungjun yoo <youngjun.willow@gmail.com>
Reviewed-by: NChao Yu <yuchao0@huawei.com>
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/file.c

@@ -95,7 +95,7 @@ static vm_fault_t f2fs_vm_page_mkwrite(struct vm_fault *vmf)
 	/* page is wholly or partially inside EOF */
 	if (((loff_t)(page->index + 1) << PAGE_SHIFT) >
 						i_size_read(inode)) {
-		unsigned offset;
+		loff_t offset;
 		offset = i_size_read(inode) & ~PAGE_MASK;
 		zero_user_segment(page, offset, PAGE_SIZE);
 	}
@@ -540,7 +540,7 @@ void f2fs_truncate_data_blocks(struct dnode_of_data *dn)
 static int truncate_partial_data_page(struct inode *inode, u64 from,
 								bool cache_only)
 {
-	unsigned offset = from & (PAGE_SIZE - 1);
+	loff_t offset = from & (PAGE_SIZE - 1);
 	pgoff_t index = from >> PAGE_SHIFT;
 	struct address_space *mapping = inode->i_mapping;
 	struct page *page;