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libc: Fix pointer types in setvbuf()

Pointers with different signess cannot be assigned.

--- a/src/libc/stdio/setvbuf.c

+++ b/src/libc/stdio/setvbuf.c

@@ -10,7 +10,7 @@

 setvbuf(FILE *restrict fp, char *restrict buf, int mode, size_t size)

 {

 	int flags;

-	char *p;

+	unsigned char *p;

 	size_t l;

 	if (_flsbuf(fp) == EOF)

@@ -17,7 +17,7 @@

 		return EOF;

 	if (buf)

-		p = buf, l = size;

+		p = (unsigned char *) buf, l = size;

 	else

 		p = fp->buf, l = fp->len;