selftests: timers: Remove unneeded semicolon

Eliminate the following coccinelle check warning:
tools/testing/selftests/timers/inconsistency-check.c:75:2-3
Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: Zhang Mingyu <zhang.mingyu@zte.com.cn>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

tools/testing/selftests/timers/inconsistency-check.c

@@ -72,7 +72,7 @@ char *clockstring(int clockid)
 		return "CLOCK_BOOTTIME_ALARM";
 	case CLOCK_TAI:
 		return "CLOCK_TAI";
-	};
+	}
 	return "UNKNOWN_CLOCKID";
 }