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[libc] Fix strncpy()

The count must be decremented in the first stage too.

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

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

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

 {

 	char *ret = dst;

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

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

 		/* nothing */;

 	while (n-- > 0)

 		*dst++ = '\0';