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mothra: do not crash on an invalid j command

--- a/sys/src/cmd/mothra/mothra.c

+++ b/sys/src/cmd/mothra/mothra.c

@@ -541,7 +541,7 @@

 		break;

 	case 'j':

 		s=arg(s);

-		if(*s)

+		if(atoi(s) <= nwww())

 			geturl(www(atoi(s)-1)->url->fullname, GET, 0, 0, 0);

 		else

 			message("no url selected");

-- 

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