Fix CVE-2023-31722

paramlen has heap memory of length nparam+1. The value of variable i may be greater than nparam+1, causing heap memory overflow. Therefore,  i and nparam+1 needs to be determined in the loop.
fix:https://bugzilla.nasm.us/show_bug.cgi?id=3392857#c1

asm/preproc.c

@@ -6817,7 +6817,7 @@ static int expand_mmacro(Token * tline)
      */
     nasm_newn(paramlen, nparam+1);
 
-    for (i = 1; (t = params[i]); i++) {
+    for (i = 1; i < nparam+1 && (t = params[i]); i++) {
         bool braced = false;
         int brace = 0;
         int white = 0;