benchtests: Clean up the alloc_bufs

Drop realloc_bufs in favour of making alloc_bufs transparently
reallocate the buffers if it had allocated before.  Also consolidate
computation of buffer lengths so that they don't get repeated on every
reallocation.

	* benchtests/bench-string.h (buf1_size, buf2_size): New
	variables.
	(init_sizes): New function.
	(test_init): Use it.
	(alloc_buf, exit_error): New functions.
	(alloc_bufs): Use ALLOC_BUF.
	(realloc_bufs): Remove.
	* benchtests/bench-memcmp.c (do_test): Adjust.
	* benchtests/bench-memset-large.c (do_test): Likewise.
	* benchtests/bench-memset-walk.c (do_test): Likewise.
	* benchtests/bench-memset.c (do_test): Likewise.
	* benchtests/bench-strncmp.c (do_test): Likewise.

1 files changed, 2 insertions, 2 deletions

diff --git a/benchtests/bench-strncmp.c b/benchtests/bench-strncmp.c
index 97dc39069d..92cf0d2145 100644
--- a/benchtests/bench-strncmp.c
+++ b/benchtests/bench-strncmp.c
@@ -150,7 +150,7 @@ do_test_limit (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len,
 
   FOR_EACH_IMPL (impl, 0)
     {
-      realloc_bufs ();
+      alloc_bufs ();
       s1 = (CHAR *) (buf1 + page_size - n * CHARBYTES);
       s2 = (CHAR *) (buf2 + page_size - n * CHARBYTES);
 
@@ -207,7 +207,7 @@ do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len, size_t
 
   FOR_EACH_IMPL (impl, 0)
     {
-      realloc_bufs ();
+      alloc_bufs ();
       s1 = (CHAR *) (buf1 + align1);
       s2 = (CHAR *) (buf2 + align2);