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[lib/c] Several small fixes

--- a/lib/c/memchr.c

+++ b/lib/c/memchr.c

@@ -4,7 +4,7 @@

 void *

 memchr(const void *s, int c, size_t n)

 {

-	unsigned char *bp = (unsigned char *) s;

+	const unsigned char *bp = s;

 	while (n > 0 && *bp++ != c)

 		--n;

--- a/lib/c/vfprintf.c

+++ b/lib/c/vfprintf.c

@@ -45,7 +45,7 @@

 	if (flags & CHAR) {

 		val = va_arg(*va, int);

-		uval = (unsigned char) uval;

+		uval = (unsigned char) val;

 	} else if (flags & SHORT) {

 		val = va_arg(*va, int);

 		uval = (unsigned short) val;

@@ -78,7 +78,7 @@

 numtostr(uintmax_t val, int flags, struct conv *conv, char *buf)

 {

 	char *buf0 = buf;

-	int len, base = conv->base, prec = conv->prec;

+	int base = conv->base, prec = conv->prec;

 	uintmax_t oval = val;

 	if (prec == -1)

@@ -197,7 +197,7 @@

 int

 vfprintf(FILE * restrict fp, const char *fmt, va_list va)

 {

-	int *p, ch, n, flags, width, left, fill, cnt = 0;

+	int ch, n, flags, width, left, fill, cnt = 0;

 	size_t inc, len;

 	char *s;

 	wchar_t *ws;