suppress null termination when fgets reads EOF with no data

the C standard requires that "the contents of the array remain
unchanged" in this case.

this patch also changes the behavior on read errors, but in that case
"the array contents are indeterminate", so the application cannot
inspect them anyway.

src/stdio/fgets.c

@@ -34,7 +34,7 @@ char *fgets(char *restrict s, int n, FILE *restrict f)
 		n--;
 		if ((*p++ = c) == '\n') break;
 	}
-	*p = 0;
+	if (s) *p = 0;
 
 	FUNLOCK(f);