lib/getrange.c: getrange(): Add const to pointer

Now that we have const-generic macros, we can use a const pointer.

Signed-off-by: Alejandro Colomar <alx@kernel.org>

lib/getrange.c

@@ -28,7 +28,7 @@ getrange(const char *range,
          unsigned long *min, bool *has_min,
          unsigned long *max, bool *has_max)
 {
-	char  *end;
+	const char  *end;
 
 	if (NULL == range)
 		return -1;