btrfs: sink get_extent parameter to __do_contiguous_readpages

All callers pass btrfs_get_extent.
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/extent_io.c

@@ -3090,7 +3090,6 @@ static int __do_readpage(struct extent_io_tree *tree,
 static inline void __do_contiguous_readpages(struct extent_io_tree *tree,
 					     struct page *pages[], int nr_pages,
 					     u64 start, u64 end,
-					     get_extent_t *get_extent,
 					     struct extent_map **em_cached,
 					     struct bio **bio,
 					     unsigned long *bio_flags,
@@ -3113,8 +3112,8 @@ static inline void __do_contiguous_readpages(struct extent_io_tree *tree,
 	}
 
 	for (index = 0; index < nr_pages; index++) {
-		__do_readpage(tree, pages[index], get_extent, em_cached, bio,
-			      0, bio_flags, 0, prev_em_start);
+		__do_readpage(tree, pages[index], btrfs_get_extent, em_cached,
+				bio, 0, bio_flags, 0, prev_em_start);
 		put_page(pages[index]);
 	}
 }
@@ -3143,8 +3142,7 @@ static void __extent_readpages(struct extent_io_tree *tree,
 		} else {
 			__do_contiguous_readpages(tree, &pages[first_index],
 						  index - first_index, start,
-						  end, btrfs_get_extent,
-						  em_cached,
+						  end, em_cached,
 						  bio, bio_flags,
 						  prev_em_start);
 			start = page_start;
@@ -3156,7 +3154,7 @@ static void __extent_readpages(struct extent_io_tree *tree,
 	if (end)
 		__do_contiguous_readpages(tree, &pages[first_index],
 					  index - first_index, start,
-					  end, btrfs_get_extent, em_cached, bio,
+					  end, em_cached, bio,
 					  bio_flags, prev_em_start);
 }