drivers/mrc_cache: Avoid unused variable assignment

Fix the scan-build warning below:

        CC         romstage/drivers/mrc_cache/mrc_cache.o
    src/drivers/mrc_cache/mrc_cache.c:450:26: warning: Value stored to 'flash' during its initialization is never read
            const struct spi_flash *flash = boot_device_spi_flash();
                                    ^~~~~   ~~~~~~~~~~~~~~~~~~~~~~~
    1 warning generated.

The function can return early before the value is read. Fix this, by
getting rid of the variable, as the value is only read once.

Change-Id: I3c94b123f4994eed9d7568b63971fd5b1d94bc09
Found-by: scan-build (clang-tools-9 1:9.0.1-12)
Signed-off-by: Paul Menzel <pmenzel@molgen.mpg.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42798
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>

0 files changed, 0 insertions, 0 deletions