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pic: error instead of crashing on nonexistent variables

--- a/sys/src/cmd/pic/misc.c

+++ b/sys/src/cmd/pic/misc.c

@@ -370,7 +370,7 @@

 	static YYSTYPE bug;

 	struct symtab *stp;

-	if (p->o_type != BLOCK) {

+	if (p == NULL || p->o_type != BLOCK) {

 		ERROR ".%s is not in that block", s WARNING;

 		return(bug);

 	}