spi: pxa2xx: Remove duplicate check

The mmio_base can't be NULL at this point. It's either checked
in both pxa_ssp_probe() and pxa2xx_spi_init_ssp() or correctly
provided by PCI core. Hence, remove duplicate check which is
a dead code.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://msgid.link/r/20240530151117.1130792-8-andriy.shevchenko@linux.intel.com


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