If you allocate with wmem, free with wmem.

Change-Id: I91476c825448cbeb8b96242236aae44d92244161
Reviewed-on: https://code.wireshark.org/review/15033
Reviewed-by: Guy Harris <guy@alum.mit.edu>

epan/addr_resolv.c

@@ -2049,7 +2049,7 @@ read_hosts_file (const char *hostspath, gboolean store_entries)
             }
         }
     }
-    g_free(line);
+    wmem_free(wmem_epan_scope(), line);
 
     fclose(hf);
     return entry_found ? TRUE : FALSE;