selftests/kcmp: Make the test output consistent and clear

Make the output format of this test consistent. Currently the output is
as follows:

+TAP version 13
+1..1
+# selftests: kcmp: kcmp_test
+# pid1:  45814 pid2:  45815 FD:  1 FILES:  1 VM:  2 FS:  1 SIGHAND:  2
+  IO:  0 SYSVSEM:  0 INV: -1
+# PASS: 0 returned as expected
+# PASS: 0 returned as expected
+# PASS: 0 returned as expected
+# # Planned tests != run tests (0 != 3)
+# # Totals: pass:3 fail:0 xfail:0 xpass:0 skip:0 error:0
+# # Planned tests != run tests (0 != 3)
+# # Totals: pass:3 fail:0 xfail:0 xpass:0 skip:0 error:0
+# # Totals: pass:0 fail:0 xfail:0 xpass:0 skip:0 error:0
+ok 1 selftests: kcmp: kcmp_test

With this patch applied the output is as follows:

+TAP version 13
+1..1
+# selftests: kcmp: kcmp_test
+# TAP version 13
+# 1..3
+# pid1:  46330 pid2:  46331 FD:  1 FILES:  2 VM:  2 FS:  2 SIGHAND:  1
+  IO:  0 SYSVSEM:  0 INV: -1
+# PASS: 0 returned as expected
+# PASS: 0 returned as expected
+# PASS: 0 returned as expected
+# # Totals: pass:3 fail:0 xfail:0 xpass:0 skip:0 error:0
+ok 1 selftests: kcmp: kcmp_test

Signed-off-by: Gautam Menghani <gautammenghani201@gmail.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

tools/testing/selftests/kcmp/kcmp_test.c

@@ -88,6 +88,9 @@ int main(int argc, char **argv)
 		int pid2 = getpid();
 		int ret;
 
+		ksft_print_header();
+		ksft_set_plan(3);
+
 		fd2 = open(kpath, O_RDWR, 0644);
 		if (fd2 < 0) {
 			perror("Can't open file");
@@ -152,7 +155,6 @@ int main(int argc, char **argv)
 			ksft_inc_pass_cnt();
 		}
 
-		ksft_print_cnts();
 
 		if (ret)
 			ksft_exit_fail();
@@ -162,5 +164,5 @@ int main(int argc, char **argv)
 
 	waitpid(pid2, &status, P_ALL);
 
-	return ksft_exit_pass();
+	return 0;
 }