drivers: nxp_enet: Fix CID 363724

This addresses the coverity issue ID 363724.
This issue seems to have been a false positive, but the root complaint
from coverity was that within the callstack of ENET_Up, some functions
use the buffer config pointer as an array, whereas in the zephyr driver
it is declared as a singleton. Address it by redeclaring this as an
array of size 1 instead of a singleton.

Signed-off-by: Declan Snyder <[email protected]>

Author: decsny

drivers/ethernet/nxp_enet/eth_nxp_enet.c

@@ -84,7 +84,7 @@ struct nxp_enet_mac_config {
 	clock_control_subsys_t clock_subsys;
 	enum mac_address_source mac_addr_source;
 	const struct pinctrl_dev_config *pincfg;
-	enet_buffer_config_t buffer_config;
+	enet_buffer_config_t buffer_config[1];
 	uint8_t phy_mode;
 	void (*irq_config_func)(void);
 	const struct device *phy_dev;
@@ -737,7 +737,7 @@ static int eth_nxp_enet_init(const struct device *dev)
 	ENET_Up(data->base,
 		  &data->enet_handle,
 		  &enet_config,
-		  &config->buffer_config,
+		  config->buffer_config,
 		  data->mac_addr,
 		  enet_module_clock_rate);
 
@@ -955,7 +955,7 @@ BUILD_ASSERT(NXP_ENET_PHY_MODE(DT_DRV_INST(n)) != NXP_ENET_RGMII_MODE ||		\
 			.clock_subsys = (void *)DT_CLOCKS_CELL_BY_IDX(			\
 						DT_INST_PARENT(n), 0, name),		\
 			.pincfg = PINCTRL_DT_INST_DEV_CONFIG_GET(n),			\
-			.buffer_config = {						\
+			.buffer_config = {{						\
 				.rxBdNumber = CONFIG_ETH_NXP_ENET_RX_BUFFERS,		\
 				.txBdNumber = CONFIG_ETH_NXP_ENET_TX_BUFFERS,		\
 				.rxBuffSizeAlign = ETH_NXP_ENET_BUFFER_SIZE,		\
@@ -967,7 +967,7 @@ BUILD_ASSERT(NXP_ENET_PHY_MODE(DT_DRV_INST(n)) != NXP_ENET_RGMII_MODE ||		\
 				.rxMaintainEnable = driver_cache_maintain,		\
 				.txMaintainEnable = driver_cache_maintain,		\
 				NXP_ENET_FRAMEINFO(n)					\
-			},								\
+			}},								\
 			.phy_mode = NXP_ENET_PHY_MODE(DT_DRV_INST(n)),			\
 			.phy_dev = DEVICE_DT_GET(DT_INST_PHANDLE(n, phy_handle)),	\
 			.mdio = DEVICE_DT_GET(DT_INST_PHANDLE(n, nxp_mdio)),		\