Fix possible buffer overflow.

tgt-vvp/vvp.c

@@ -80,15 +80,16 @@ __inline__ static void draw_module_declarations(ivl_design_t des)
       const char*cp = ivl_design_flag(des, "VPI_MODULE_LIST");
 
       while (*cp) {
-	    char buffer[128];
 	    const char*comma = strchr(cp, ',');
 
 	    if (comma == 0)
 		  comma = cp + strlen(cp);
 
+	    char*buffer = malloc(comma - cp + 1);
 	    strncpy(buffer, cp, comma-cp);
 	    buffer[comma-cp] = 0;
 	    fprintf(vvp_out, ":vpi_module \"%s\";\n", buffer);
+	    free(buffer);
 
 	    cp = comma;
 	    if (*cp) cp += 1;