spi: spi: Remove unnecessary ‘0’ values from rc

rc is assigned first, so it does not need to initialize the assignment.

Signed-off-by: Li zeming <zeming@nfschina.com>
Link: https://patch.msgid.link/20240708035320.14241-1-zeming@nfschina.com


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