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git/get: properly skip entire argument string once the nheads limit is surpassed (thanks ori)

--- a/sys/src/cmd/git/get.c

+++ b/sys/src/cmd/git/get.c

@@ -477,6 +477,7 @@

 void

 main(int argc, char **argv)

 {

+	char *s;

 	Conn c;

 	ARGBEGIN{

@@ -485,8 +486,9 @@

 	case 'd':	chattygit++;			break;

 	case 'l':	listonly++;			break;

 	case 'h':

+		s = EARGF(usage());

 		if(nheads < nelem(heads))

-			if(hparse(&heads[nheads], EARGF(usage())) == 0)

+			if(hparse(&heads[nheads], s) == 0)

 				nheads++;

 		break;

 	default:

-- 

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