branches/zip: buf_buddy_free_low(): Use a byte pointer in arithmetics.

buf_buddy_get(): Document that "page" should be a pointer to char or byte.

buf/buf0buddy.c

@@ -447,7 +447,8 @@ buf_buddy_free_low(
 		}
 
 		/* Try to relocate the buddy of the free block to buf. */
-		buddy = buf_buddy_get(bpage, BUF_BUDDY_LOW << i);
+		buddy = (buf_page_t*) buf_buddy_get(((byte*) bpage),
+						    BUF_BUDDY_LOW << i);
 
 #ifdef UNIV_DEBUG
 		{

include/buf0buddy.h

@@ -29,7 +29,8 @@ buf_buddy_get_offset(
 	__attribute__((nonnull));
 
 /**************************************************************************
-Get the buddy of a compressed page frame. */
+Get the buddy of a compressed page frame.
+Note: "page" should be a pointer to byte or char. */
 #define buf_buddy_get(page,size) ((page) + buf_buddy_get_offset((page),(size)))
 
 /**************************************************************************