drivers: dma_mcux_lpc: Fix potential NULL pointer dereferences

static int dma_mcux_lpc_configure(const struct device *dev, uint32_t channel,

				  struct dma_config *config)

{

	const struct dma_mcux_lpc_config *dev_config = dev->config;

	const struct dma_mcux_lpc_config *dev_config;

	dma_handle_t *p_handle;

	uint32_t xfer_config = 0U;

	struct channel_data *data;

	struct dma_mcux_lpc_dma_data *dma_data = dev->data;

	struct dma_block_config *block_config = config->head_block;

	struct dma_mcux_lpc_dma_data *dma_data;

	struct dma_block_config *block_config;

	uint32_t virtual_channel;

	uint32_t total_dma_channels;

	uint8_t otrig_index;

	uint8_t src_inc, dst_inc;

	bool is_periph = true;

	uint8_t width = MIN(config->source_data_size, config->dest_data_size);

	uint32_t max_xfer = NXP_LPC_DMA_MAX_XFER * width;

	uint8_t width;

	uint32_t max_xfer;

	uint8_t reload = 0;

	if (NULL == dev || NULL == config) {

		return -EINVAL;

	}

	dev_config = dev->config;

	dma_data = dev->data;

	block_config = config->head_block;

	width = MIN(config->source_data_size, config->dest_data_size);

	max_xfer = NXP_LPC_DMA_MAX_XFER * width;

	/*

	 * Check if circular mode is requested.

	 */