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cons: fix out-of-bounds access when given command without subcommand

--- a/cons.c

+++ b/cons.c

@@ -314,7 +314,7 @@

 				continue;

 			ap++; na--;

 			if(c->sub != nil){

-				if(strcmp(c->sub, *ap) != 0)

+				if(na == 0 || strcmp(c->sub, *ap) != 0)

 					continue;

 				ap++;

 				na--;