Cover edge case of WRITESTRINGN

src/d_netfil.c

@@ -131,7 +131,7 @@ UINT8 *PutFileNeeded(UINT16 firstfile)
 		nameonly(strcpy(wadfilename, wadfiles[i]->filename));
 
 		// Look below at the WRITE macros to understand what these numbers mean.
-		if (p + 1 + 4 + strlen(wadfilename) + 1 + 16 > p_start + MAXFILENEEDED)
+		if (p + 1 + 4 + min(strlen(wadfilename) + 1, MAX_WADPATH) + 16 > p_start + MAXFILENEEDED)
 		{
 			// Too many files to send all at once
 			if (netbuffer->packettype == PT_MOREFILESNEEDED)