CVE-2025-38648 spi: stm32: Check for cfg availability in stm32_spi_probe

In the Linux kernel, the following vulnerability has been resolved: spi: stm32: Check for cfg availability in stm32spiprobe The stm32spiprobe function now includes a check to ensure that the pointer returned by ofdevicegetmatchdata is not NULL before accessing its members. This resolves a warning...