Fix the functions to match prototypes. The K&R definitions differ

from the ANSI-C prototype due to the 'int promotion' rule.

lib/libc/string/memchr.c

@@ -39,7 +39,7 @@ __FBSDID("$FreeBSD$");
 #include <string.h>
 
 void *
-memchr(const void *s, unsigned char c, size_t n)
+memchr(const void *s, int c, size_t n)
 {
 	if (n != 0) {
 		const unsigned char *p = s;

lib/libc/string/strmode.c

@@ -38,7 +38,7 @@ __FBSDID("$FreeBSD$");
 #include <string.h>
 
 void
-strmode(mode_t mode, char *p)
+strmode(/* mode_t */ int mode, char *p)
 {
 	 /* print type */
 	switch (mode & S_IFMT) {

lib/libc/string/wmemset.c

@@ -37,7 +37,7 @@ __FBSDID("$FreeBSD$");
 #include <wchar.h>
 
 wchar_t	*
-wmemset(wchar_t *s, wchar_t *c, size_t n)
+wmemset(wchar_t *s, wchar_t c, size_t n)
 {
 	size_t i;
 	wchar_t *p;