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Check return value of getcwd.

	Some systems warn.

--- a/6/gengas.c

+++ b/6/gengas.c

@@ -350,7 +350,8 @@

 	char cwd[1024];

 	resetregs();

-	getcwd(cwd, sizeof cwd);

+	if (!getcwd(cwd, sizeof cwd))

+		die("getcwd failed: %s\n", cwd);

 	is.reglocs = mkht(varhash, vareq);

 	is.name = fn->name;

 	is.stkoff = fn->stkoff;