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lex: fix uninitialized fds (thanks きゐ)

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

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

@@ -43,6 +43,8 @@

 	if(nine) {

 		Bprint(&fout,

 				"int infd, outfd;\n"

+				"outfd = 1;\n"

+				"infd = 0;\n"

 				"\n"

 				"void\n"

 				"output(char c)\n"