Fix a leak I caused in the libcorkscrew test program.

Change-Id: Iecbe006721d462694d48f32bca1606443b9c9714
diff --git a/libcorkscrew/test.c b/libcorkscrew/test.c
index 1d6c3cb..af34c03 100644
--- a/libcorkscrew/test.c
+++ b/libcorkscrew/test.c
@@ -36,7 +36,7 @@
       } else {
         fprintf(stderr, "  %s (\?\?\?)\n", line);
       }
-      free(symbols);
+      free_symbol_table(symbols);
     }
   }