drivers: sensor: adi: adxl372: Remove logically dead code

[alexapostolu]

Remove logically dead if and else-if conditions as shown by the static analysis (#90531 ), replacing with the else statement.

When data_opt is assigned to the MIN of fifo_wmark_cfg and fifo_full_cfg, both those variables will be non-NULL as an earlier condition ensures the function returns if either one of the variables is NULL before assigning to data_opt.

Condition that ensures the function returns if either one of the variables is NULL,

	bool fifo_full_irq = false;

	if ((fifo_wmark_cfg != NULL) && (fifo_full_cfg != NULL) &&
	    FIELD_GET(ADXL372_INT1_MAP_FIFO_FULL_MSK, status1)) {
		fifo_full_irq = true;
	}

	if (!fifo_full_irq) {
		gpio_pin_interrupt_configure_dt(&cfg->interrupt, GPIO_INT_EDGE_TO_ACTIVE);
		return;
	}

Fixes #90531
Fixes #90550

[MaureenHelm]

@vladislav-pejic can you take a look?

[alexapostolu]

Force pushed to fix commit message being too long

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[alexapostolu]

@MaureenHelm just pinging again to get this reviewed, thanks!