lib/string: change return types to match C standard

The return type of strspn and strcspn is supposed to be a size_t and not
a signed integer.

TEST=Now the openSIL code can be built with the coreboot headers without
needing to add '-Wno-builtin-declaration-mismatch' or
'-Wno-incompatible-library-redeclaration' to the cflags. Before the
build would error out with various 'mismatch in return type of built-in
function' errors.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I0ff612e2eee4f556f5c572b02cbc600ca411ae20
Reviewed-on: https://review.coreboot.org/c/coreboot/+/83223
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-by: Varshit Pandya <pandyavarshit@gmail.com>
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>

0 files changed, 0 insertions, 0 deletions