libpayload/libc: Tidy utf16le_to_ascii

- Constify the string argument
- Change int to size_t, which is what xmalloc expects

Change-Id: I8b5a13319ded4025f883760f2b6d4d7a9ad9fb8b
Signed-off-by: Jacob Garber <jgarber1@ualberta.ca>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/33793
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>

1 files changed, 2 insertions, 3 deletions

diff --git a/payloads/libpayload/libc/string.c b/payloads/libpayload/libc/string.c
index 9a5a1ea4c1..fd88a88ad2 100644
--- a/payloads/libpayload/libc/string.c
+++ b/payloads/libpayload/libc/string.c
@@ -645,12 +645,11 @@ char *strerror(int errnum)
  * @param maxlen Maximum possible length of the string in code points
  * @return Newly allocated ASCII string
  */
-char *utf16le_to_ascii(uint16_t *utf16_string, int maxlen)
+char *utf16le_to_ascii(const uint16_t *utf16_string, size_t maxlen)
 {
 	char *ascii_string = xmalloc(maxlen + 1);  /* +1 for trailing \0 */
 	ascii_string[maxlen] = '\0';
-	int i;
-	for (i = 0; i < maxlen; i++) {
+	for (size_t i = 0; i < maxlen; i++) {
 		uint16_t wchar = utf16_string[i];
 		ascii_string[i] = wchar > 0x7f ? '?' : (char)wchar;
 	}