Fix gcc 9 build errors for make xcheck. [BZ #24556]

This patch fixes the following gcc 9 warnings for "make xcheck" / "make bench":
-string/tst-strcasestr.c:
../include/bits/../../misc/bits/error.h:42:5: error: ‘%s’ directive argument is null [-Werror=format-overflow=]

-argp/argp-test.c:
argp-test.c:130:20: error: ‘%d’ directive writing between 1 and 11 bytes into a region of size 10 [-Werror=format-overflow=]
argp-test.c:130:19: note: directive argument in the range [-2147483648, 122]
argp-test.c:130:5: note: ‘sprintf’ output between 2 and 12 bytes into a destination of size 10

-nss/tst-field.c:
tst-field.c:52:7: error: ‘%s’ directive argument is null [-Werror=format-overflow=]

-benchtests/bench-strstr.c:
../include/bits/../../misc/bits/error.h:42:5: error: ‘%s’ directive argument is null [-Werror=format-overflow=]

-benchtests/bench-malloc-simple.c:
bench-malloc-simple.c:93:16: error: iteration 3 invokes undefined behavior [-Werror=aggressive-loop-optimizations]

ChangeLog:

	[BZ #24556]
	* string/test-strcasestr.c (check_result): Add NULL check.
	* nss/tst-field.c (check_rewrite): Likewise.
	* benchtests/bench-strstr.c (do_one_test): Likewise.
	* string/test-strstr.c (check_result): Likewise.
	* argp/argp-test.c (popt): Increase size of buf to 12.
	* benchtests/bench-malloc-simple.c (bench):
	Do not initialize tests array out of bounds.

2 files changed, 3 insertions, 2 deletions

diff --git a/benchtests/bench-malloc-simple.c b/benchtests/bench-malloc-simple.c
index b8bb2cc..c4f06f6 100644
--- a/benchtests/bench-malloc-simple.c
+++ b/benchtests/bench-malloc-simple.c
@@ -87,7 +87,7 @@ bench (unsigned long size)
   size_t iters = NUM_ITERS;
   int **arr = (int**) malloc (MAX_ALLOCS * sizeof (void*));
 
-  for (int t = 0; t <= 3; t++)
+  for (int t = 0; t < 3; t++)
     for (int i = 0; i < NUM_ALLOCS; i++)
       {
 	tests[t][i].n = allocs[i];
diff --git a/benchtests/bench-strstr.c b/benchtests/bench-strstr.c
index 2cbe13e..89d1755 100644
--- a/benchtests/bench-strstr.c
+++ b/benchtests/bench-strstr.c
@@ -147,7 +147,8 @@ do_one_test (impl_t *impl, const char *s1, const char *s2, char *exp_result)
   if (res != exp_result)
     {
       error (0, 0, "Wrong result in function %s %s %s", impl->name,
-	     res, exp_result);
+	     (res == NULL) ? "(null)" : res,
+	     (exp_result == NULL) ? "(null)" : exp_result);
       ret = 1;
     }
 }