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[libc] Fix strncpy

Don't forget n is unsigned.

--- a/libc/src/strncpy.c

+++ b/libc/src/strncpy.c

@@ -7,8 +7,8 @@

 {

 	char *ret = dst;

-	while (n-- > 0 && (*dst++ = *src++))

-		/* nothing */;

+	for (; n > 0 && *src; --n)

+		*dst++ = *src++;

 	while (n-- > 0)

 		*dst++ = '\0';

 	return ret;