src/drivers: Fix two issues discovered by checkpatch

Change-Id: I46e318333e68b999b2889f51fa2fbf140a27a54e
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37357
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/drivers/spi/tpm/tis.c

@@ -9,7 +9,7 @@
 
 #include "tpm.h"
 
-static unsigned tpm_is_open;
+static unsigned int tpm_is_open;
 
 static const struct {
 	uint16_t vid;