pxa_ssp_request() implies a reference counting, hence the pxa_ssp_free()
must be called when we are done. Add missed call.

Fixes: bb77c99e ("spi: pxa2xx: Skip SSP initialization if it's done elsewhere")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://msgid.link/r/20240402144523.3402063-1-andriy.shevchenko@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>