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cc/lex: do not crash on -I without arg

--- a/sys/src/cmd/cc/lex.c

+++ b/sys/src/cmd/cc/lex.c

@@ -80,7 +80,8 @@

 	case 'I':

 		p = ARGF();

-		setinclude(p);

+		if(p)

+			setinclude(p);

 		break;

 	} ARGEND

 	if(argc < 1 && outfile == 0) {