drivers: uart: esp32: apply correct mask for TX/RX signal inversion

Build a combined mask from the tx_invert and rx_invert flags and pass it
to uart_hal_inverse_signal(). Only invoke the HAL call when the mask is
non-zero, preventing unintended inversions and eliminating redundant
calls when no inversion is requested.

Signed-off-by: Sylvio Alves <sylvio.alves@espressif.com>

drivers/serial/uart_esp32.c

@@ -271,6 +271,7 @@ static int uart_esp32_configure(const struct device *dev, const struct uart_conf
 	struct uart_esp32_data *data = dev->data;
 	uart_sclk_t src_clk;
 	uint32_t sclk_freq;
+	uint32_t inv_mask = 0;
 
 	int ret = pinctrl_apply_state(config->pcfg, PINCTRL_STATE_DEFAULT);
 
@@ -359,12 +360,16 @@ static int uart_esp32_configure(const struct device *dev, const struct uart_conf
 	uart_hal_set_rx_timeout(&data->hal, 0x16);
 
 	if (config->tx_invert) {
-		uart_hal_inverse_signal(&data->hal, UART_SIGNAL_TXD_INV);
+		inv_mask |= UART_SIGNAL_TXD_INV;
 	}
-
 	if (config->rx_invert) {
-		uart_hal_inverse_signal(&data->hal, UART_SIGNAL_RXD_INV);
+		inv_mask |= UART_SIGNAL_RXD_INV;
+	}
+
+	if (inv_mask) {
+		uart_hal_inverse_signal(&data->hal, inv_mask);
 	}
+
 	return 0;
 }