selftests/watchdog: Fix spelling mistake "Temeprature" -> "Temperature"

There is a spelling mistake in a print statement. Fix it.
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

tools/testing/selftests/watchdog/watchdog-test.c

@@ -260,7 +260,7 @@ int main(int argc, char *argv[])
 			if (ret)
 				printf("WDIOC_GETTEMP: '%s'\n", strerror(errno));
 			else
-				printf("Temeprature: %d\n", temperature);
+				printf("Temperature %d\n", temperature);
 
 			break;
 		case 't':