msi: Free the custom action data after the thread function executes.

dlls/msi/custom.c

@@ -452,9 +452,6 @@ static UINT wait_thread_handle( msi_custom_action_info *info )
     else
     {
         TRACE("%s running in background\n", debugstr_w( info->action ));
-
-        if (info->type & msidbCustomActionTypeContinue)
-            free_custom_action_data( info );
     }
 
     return rc;
@@ -529,6 +526,10 @@ static DWORD WINAPI ACTION_CallDllFunction( const LPGUID guid )
 
     FreeLibrary(hModule);
 
+    if (info->type & msidbCustomActionTypeAsync &&
+        info->type & msidbCustomActionTypeContinue)
+        free_custom_action_data( info );
+
     return r;
 }