spi: spi-pci1xxxx: Fix error code in probe

Return the error code if pci_alloc_irq_vectors() fails.  Don't return
success.

Fixes: b4608e94 ("spi: spi-pci1xxxx: Fix Probe failure with Dual SPI instance with INTx interrupts")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Thangaraj Samynathan <thangaraj.s@microchip.com>
Link: https://patch.msgid.link/aEKvDrUxD19GWi0u@stanley.mountain


Signed-off-by: Mark Brown <broonie@kernel.org>