[grblHAL/STM32F4xx Issue#125] Issue when both SPI_IRQ and I2C_STROBE are enabled

Here in the driver:
https://github.com/grblHAL/STM32F4xx/blob/master/Src/driver.c#L488

When both are enabled the I2C strobe fails the second condition even if both are on separate IRQ pins. In my quick testing this fixed it on line 493:

“
#ifdef SPIIRQPIN

else if((ok = irq == IRQSPI && spiirq.callback == NULL))
spi_irq.callback = handler;

#endif
“

but above is not a universal fix.