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fix null dereference crash in mothra

--- a/sys/src/cmd/mothra/mothra.c

+++ b/sys/src/cmd/mothra/mothra.c

@@ -1016,9 +1016,11 @@

 			plrtstr(&t->next, 0, 0, t->font, strdup("->"), PL_HOT, ap);

 			t->next->next = x;

 		} else {

-			t->next = x->next;

-			x->next = nil;

-			freetext(x);

+			if(x) {

+				t->next = x->next;

+				x->next = nil;

+				freetext(x);

+			}

 		}

 	}

 	updtext(w);