perf test: Use TEST_FAIL in the TEST_ASSERT macros instead of -1

Just to make things clearer, return TEST_FAIL (-1) instead of an open
coded -1.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Reviewed-by: Ian Rogers <irogers@google.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/ZdepeMsjagbf1ufD@x1

tools/perf/tests/tests.h

@@ -4,11 +4,17 @@
 
 #include <stdbool.h>
 
+enum {
+	TEST_OK   =  0,
+	TEST_FAIL = -1,
+	TEST_SKIP = -2,
+};
+
 #define TEST_ASSERT_VAL(text, cond)					 \
 do {									 \
 	if (!(cond)) {							 \
 		pr_debug("FAILED %s:%d %s\n", __FILE__, __LINE__, text); \
-		return -1;						 \
+		return TEST_FAIL;					 \
 	}								 \
 } while (0)
 
@@ -17,16 +23,10 @@ do {									 \
 	if (val != expected) {						 \
 		pr_debug("FAILED %s:%d %s (%d != %d)\n",		 \
 			 __FILE__, __LINE__, text, val, expected);	 \
-		return -1;						 \
+		return TEST_FAIL;						 \
 	}								 \
 } while (0)
 
-enum {
-	TEST_OK   =  0,
-	TEST_FAIL = -1,
-	TEST_SKIP = -2,
-};
-
 struct test_suite;
 
 typedef int (*test_fnptr)(struct test_suite *, int);