perf test: Simplify for_each_test() to avoid tripping on -Werror=array-bounds

When cross building on debian to the mips 32-bit arch we get these
warnings:

  In function '__cmd_test',
      inlined from 'cmd_test' at tests/builtin-test.c:561:9:
  tests/builtin-test.c:260:66: error: array subscript 1 is outside array bounds of 'struct test_suite *[1]' [-Werror=array-bounds]
    260 |                 for (k = 0, t = tests[j][k]; tests[j][k]; k++, t = tests[j][k])
        |                                                                  ^
  tests/builtin-test.c:369:9: note: in expansion of macro 'for_each_test'
    369 |         for_each_test(j, k, t) {
        |         ^~~~~~~~~~~~~
  tests/builtin-test.c: In function 'cmd_test':
  tests/builtin-test.c:36:27: note: at offset 4 into object 'arch_tests' of size 4
     36 | struct test_suite *__weak arch_tests[] = {
        |                           ^~~~~~~~~~
  cc1: all warnings being treated as errors

Switch to using a while(!sentinel) for the second level of the 'tests'
array to avoid that compiler complaint.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/tests/builtin-test.c

@@ -256,8 +256,8 @@ static int run_test(struct test_suite *test, int subtest)
 }
 
 #define for_each_test(j, k, t)			\
-	for (j = 0; j < ARRAY_SIZE(tests); j++)	\
-		for (k = 0, t = tests[j][k]; tests[j][k]; k++, t = tests[j][k])
+	for (j = 0, k = 0; j < ARRAY_SIZE(tests); j++, k = 0)	\
+		while ((t = tests[j][k++]) != NULL)
 
 static int test_and_print(struct test_suite *t, int subtest)
 {