l3gd20: fix if style

src/drivers/l3gd20/l3gd20.cpp

@@ -784,8 +784,9 @@ L3GD20::set_samplerate(unsigned frequency)
 {
 	uint8_t bits = REG1_POWER_NORMAL | REG1_Z_ENABLE | REG1_Y_ENABLE | REG1_X_ENABLE;
 
-	if (frequency == 0 || frequency == GYRO_SAMPLERATE_DEFAULT)
+	if (frequency == 0 || frequency == GYRO_SAMPLERATE_DEFAULT) {
 		frequency = _is_l3g4200d ? 800 : 760;
+	}
 
 	/*
 	 * Use limits good for H or non-H models. Rates are slightly different