Eliminate pointless assignment

Compiler lint:

    src/lib/libast/tm/tmxscan.c:364:21: Value stored to 'x' is never read

The call is solely for its side-effects. No need to store the return value.

Author: krader1961

src/lib/libast/tm/tmxscan.c

@@ -361,7 +361,7 @@ static_fn Time_t tmx_scan(const char *s, char **e, const char *format, char **f,
                     s = b;
                     goto again;
                 case '&':
-                    x = tmx_gen(tm, &set);
+                    (void)tmx_gen(tm, &set);
                     x = tmxdate(s, e, t);
                     if (s == (const char *)*e) goto next;
                     t = x;