Two memory leaks found interactively with valgrind with safe fixes.

src/frontend/arg.c

@@ -133,6 +133,7 @@ static void common(const char *string, const struct wordlist *wl,
         w = process(w);
         /* O.K. now call fn */
         command->co_func(w);
+        wl_free(w);
     }
 } /* end of function common */
 

src/frontend/variable.c

@@ -1156,6 +1156,8 @@ void cp_vprint(void)
                 out_printf("( %s )\n", s);
             else
                 out_printf("%s\n", s);
+            wl_free(wl);
+            tfree(s);
         }
     }