androiddump: fix compilation with ANDROIDDUMP_USE_LIBPCAP define

Change-Id: I6edc4ff9f4db5fab9b80cb0be56639443ab22518
Reviewed-on: https://code.wireshark.org/review/20105
Reviewed-by: Pascal Quantin <pascal.quantin@gmail.com>

extcap/androiddump.c

@@ -2785,7 +2785,10 @@ int main(int argc, char **argv) {
 end:
     /* clean up stuff */
     extcap_base_cleanup(&extcap_conf);
+#ifndef ANDROIDDUMP_USE_LIBPCAP
     wtap_cleanup();
+#endif
+
     return ret;
 }