Under certain conditions the condition parser would go one past end of

the string. Until now this caused no harm, because the buffer code used
to tack two NULs onto buffers. With the new, soon to come, parsing code
this isn't the case anymore in all cases, so fix this.

usr.bin/make/cond.c

@@ -628,7 +628,7 @@ CondToken(Boolean doEval)
 			}
 			free(string);
 			if (rhs == condExpr) {
-				if (!qt && *cp == ')')
+				if (*cp == '\0' || (!qt && *cp == ')'))
 					condExpr = cp;
 				else
 					condExpr = cp + 1;