Fixed offset of frameskip command-line option

zsnes/src/dos/zloader.c

@@ -154,6 +154,7 @@ int pccmdline(void)
           if(!hasroom) return 4;
           frameskip=my_atoi(argv[p+1]);
           if(frameskip > 9) return 10;
+          frameskip++;
           p++;
           break;
         }

zsnes/src/linux/zloaderw.c

@@ -190,8 +190,8 @@ int main (int argc, char *argv[]) {
 			case 'f': {
 //				if (!hasroom) return 4;
 				frameskip = my_atoi(optarg);
-
 				if (frameskip > 9) return 10;
+                                frameskip++;
 				p++;
 				break;
 			}

zsnes/src/win/zloaderw.c

@@ -301,6 +301,7 @@ int pccmdline(void)
           if(!hasroom) return 4;
           frameskip=my_atoi(argv[p+1]);
           if(frameskip > 9) return 10;
+          frameskip++;
           p++;
           break;
         }