media: saa7164: add ioremap return checks and cleanups

In the Linux kernel, the following vulnerability has been resolved:

media: saa7164: add ioremap return checks and cleanups

Add checks for ioremap return values in saa7164_dev_setup(). If

ioremap for BAR0 or BAR2 fails, release the already allocated PCI

memory regions, remove the device from the global list, decrement

the device count, and return -ENODEV.

This prevents potential null pointer dereferences and ensures proper

cleanup on memory mapping failures.