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gs: fix dangleing pointer crash with "lock" (ghostscript Bug 697204)

--- a/sys/src/cmd/gs/src/zcontext.c

+++ b/sys/src/cmd/gs/src/zcontext.c

@@ -953,6 +953,7 @@

 	return_error(e_VMerror);

     plock->holder_index = 0;

     plock->waiting.head_index = plock->waiting.tail_index = 0;

+    plock->scheduler = NULL;

     push(1);

     make_istruct(op, a_all, plock);

     return 0;