nvramcui: Cast u8 * values to char * to eliminate warnings

error: pointer targets of 'strcmp' differ in signedness
expected 'const char *' but argument is of type
'u8 * {aka unsigned char *}'

Change-Id: Id5cbb6fc2efd7c57abc59b08416047e10461436f
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/14521
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
1 file changed