Free pointer lib before function returns.

In function main, the pointer lib allocated at line 7 is passed as an argument to functions uv_dlopen at line 10, uv_dlerror at lines 11 and 17, and uv_dlsym at line 16, but it is never freed before the function returns at line 24. This results in a memory leak bug.

docs/code/plugin/main.c

@@ -34,6 +34,6 @@ int main(int argc, char **argv) {
 
         init_plugin();
     }
-
+    free(lib);
     return 0;
 }