iio: pressure: bmp280: Fix NULL pointer exception

The bmp085 EOC IRQ support is optional, but the driver's common probe
function queries the IRQ properties whether or not it exists, which
can trigger a NULL pointer exception. Avoid any exception by making
the query conditional on the possession of a valid IRQ.

Fixes: aae95394 ("iio: pressure: bmp280: add support for BMP085 EOC interrupt")
Signed-off-by: Phil Elwell <phil@raspberrypi.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20230811155829.51208-1-phil@raspberrypi.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/pressure/bmp280-core.c

@@ -2179,7 +2179,7 @@ int bmp280_common_probe(struct device *dev,
 	 * however as it happens, the BMP085 shares the chip ID of BMP180
 	 * so we look for an IRQ if we have that.
 	 */
-	if (irq > 0 || (chip_id  == BMP180_CHIP_ID)) {
+	if (irq > 0 && (chip_id  == BMP180_CHIP_ID)) {
 		ret = bmp085_fetch_eoc_irq(dev, name, irq, data);
 		if (ret)
 			return ret;