drivers: uart_nrfx_uart{,e}: on clear async pointers when enabled

Fix a build error introduced in 9f02eea, the async pointers are only
available when UARTE_ANY_ASYNC is set.

Signed-off-by: Fabio Baltieri <fabiobaltieri@google.com>

Author: fabiobaltieri

drivers/serial/uart_nrfx_uart.c

@@ -405,7 +405,7 @@ static int uart_nrfx_callback_set(const struct device *dev,
 	uart0_cb.callback = callback;
 	uart0_cb.user_data = user_data;
 
-#if defined(CONFIG_UART_EXCLUSIVE_API_CALLBACKS)
+#if defined(CONFIG_UART_EXCLUSIVE_API_CALLBACKS) && defined(CONFIG_UART_0_INTERRUPT_DRIVEN)
 	irq_callback = NULL;
 	irq_cb_data = NULL;
 #endif
@@ -929,7 +929,7 @@ static void uart_nrfx_irq_callback_set(const struct device *dev,
 	irq_callback = cb;
 	irq_cb_data = cb_data;
 
-#if defined(CONFIG_UART_EXCLUSIVE_API_CALLBACKS)
+#if defined(CONFIG_UART_0_ASYNC) && defined(CONFIG_UART_EXCLUSIVE_API_CALLBACKS)
 	uart0_cb.callback = NULL;
 	uart0_cb.user_data = NULL;
 #endif

drivers/serial/uart_nrfx_uarte.c

@@ -937,7 +937,7 @@ static int uarte_nrfx_callback_set(const struct device *dev,
 	data->async->user_callback = callback;
 	data->async->user_data = user_data;
 
-#if defined(CONFIG_UART_EXCLUSIVE_API_CALLBACKS)
+#if defined(CONFIG_UART_EXCLUSIVE_API_CALLBACKS) && defined(UARTE_INTERRUPT_DRIVEN)
 	data->int_driven->cb = NULL;
 	data->int_driven->cb_data = NULL;
 #endif
@@ -1681,7 +1681,7 @@ static void uarte_nrfx_irq_callback_set(const struct device *dev,
 	data->int_driven->cb = cb;
 	data->int_driven->cb_data = cb_data;
 
-#if defined(CONFIG_UART_EXCLUSIVE_API_CALLBACKS)
+#if defined(UARTE_ANY_ASYNC) && defined(CONFIG_UART_EXCLUSIVE_API_CALLBACKS)
 	data->async->user_callback = NULL;
 	data->async->user_data = NULL;
 #endif