Improved validation of monster/boss_monster top-level script objects

- xs, ys, delay1, delay2 and event are now required, as described in
  the documentation.

Signed-off-by: Haru <haru@dotalux.com>

src/map/npc.c

@@ -3531,10 +3531,10 @@ const char* npc_parse_mob(char* w1, char* w2, char* w3, char* w4, const char* st
 
 	// w1=<map name>,<x>,<y>,<xs>,<ys>
 	// w3=<mob name>{,<mob level>}
-	// w4=<mob id>,<amount>,<delay1>,<delay2>,<event>{,<mob size>,<mob ai>}
-	if( sscanf(w1, "%31[^,],%d,%d,%d,%d", mapname, &x, &y, &xs, &ys) < 3
+	// w4=<mob id>,<amount>,<delay1>,<delay2>{,<event>,<mob size>,<mob ai>}
+	if( sscanf(w1, "%31[^,],%d,%d,%d,%d", mapname, &x, &y, &xs, &ys) < 5
 	 || sscanf(w3, "%23[^,],%d", mobname, &mob_lv) < 1
-	 || sscanf(w4, "%d,%d,%u,%u,%50[^,],%d,%d[^\t\r\n]", &class_, &num, &mobspawn.delay1, &mobspawn.delay2, mobspawn.eventname, &size, &ai) < 2
+	 || sscanf(w4, "%d,%d,%u,%u,%50[^,],%d,%d[^\t\r\n]", &class_, &num, &mobspawn.delay1, &mobspawn.delay2, mobspawn.eventname, &size, &ai) < 4
 	 ) {
 		ShowError("npc_parse_mob: Invalid mob definition in file '%s', line '%d'.\n * w1=%s\n * w2=%s\n * w3=%s\n * w4=%s\n", filepath, strline(buffer,start-buffer), w1, w2, w3, w4);
 		if (retval) *retval = EXIT_FAILURE;