Remove a bogus Valgrind "suppression".

fsp_init_file_page_low() does initialize all pages nowadays,
even those in the InnoDB system tablespace.

storage/innobase/buf/buf0buf.c

@@ -2,6 +2,7 @@
 
 Copyright (c) 1995, 2015, Oracle and/or its affiliates. All Rights Reserved.
 Copyright (c) 2008, Google Inc.
+Copyright (c) 2014, 2017, MariaDB Corporation. All Rights Reserved.
 
 Portions of this file contain modifications contributed and copyrighted by
 Google, Inc. Those modifications are gratefully acknowledged and are described
@@ -2997,15 +2998,6 @@ buf_page_init(
 	/* Set the state of the block */
 	buf_block_set_file_page(block, space, offset);
 
-#ifdef UNIV_DEBUG_VALGRIND
-	if (!space) {
-		/* Silence valid Valgrind warnings about uninitialized
-		data being written to data files.  There are some unused
-		bytes on some pages that InnoDB does not initialize. */
-		UNIV_MEM_VALID(block->frame, UNIV_PAGE_SIZE);
-	}
-#endif /* UNIV_DEBUG_VALGRIND */
-
 	buf_block_init_low(block);
 
 	block->lock_hash_val = lock_rec_hash(space, offset);

storage/xtradb/buf/buf0buf.c

@@ -2,6 +2,7 @@
 
 Copyright (c) 1995, 2015, Oracle and/or its affiliates. All Rights Reserved.
 Copyright (c) 2008, Google Inc.
+Copyright (c) 2014, 2017, MariaDB Corporation. All Rights Reserved.
 
 Portions of this file contain modifications contributed and copyrighted by
 Google, Inc. Those modifications are gratefully acknowledged and are described
@@ -3349,15 +3350,6 @@ buf_page_init(
 	/* Set the state of the block */
 	buf_block_set_file_page(block, space, offset);
 
-#ifdef UNIV_DEBUG_VALGRIND
-	if (!space) {
-		/* Silence valid Valgrind warnings about uninitialized
-		data being written to data files.  There are some unused
-		bytes on some pages that InnoDB does not initialize. */
-		UNIV_MEM_VALID(block->frame, UNIV_PAGE_SIZE);
-	}
-#endif /* UNIV_DEBUG_VALGRIND */
-
 	buf_block_init_low(block);
 
 	block->lock_hash_val = lock_rec_hash(space, offset);