spi: spi-zynq-qspi: Fix some wrong goto jumps & missing error code

In zynq_qspi_probe function, when enable the device clock is done,
the return of all the functions should goto the clk_dis_all label.

If num_cs is not right then this should return a negative error
code but currently it returns success.

Signed-off-by: zpershuai <zpershuai@gmail.com>
Link: https://lore.kernel.org/r/1622110857-21812-1-git-send-email-zpershuai@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>