Add target_read_memory wrapper:

- replaces all calls to target->type->read_memory.
- add documentation in target_s to warn not to invoke callback directly.


git-svn-id: svn://svn.berlios.de/openocd/trunk@1959 b42882b7-edfa-0310-969c-e2dbd0fdcd60

src/flash/at91sam7.c

@@ -665,7 +665,7 @@ static int at91sam7_erase_check(struct flash_bank_s *bank)
 	for (nSector=0; nSector<bank->num_sectors; nSector++)
 	{
 		bank->sectors[nSector].is_erased = 1;
-		retval = target->type->read_memory(target, bank->base+bank->sectors[nSector].offset, 4,
+		retval = target_read_memory(target, bank->base+bank->sectors[nSector].offset, 4,
 			bank->sectors[nSector].size/4, buffer);
 		if (retval != ERROR_OK)
 			return retval;