window: Initialize drag action for tab bar

The `‘action’ may be used uninitialized` warning is shown during build
currently. It can really happen that uninitialized value is used when
dropping something else then the `GDK_TYPE_FILE_LIST` and `G_TYPE_STRING`
on the tab bar. Let's initialize the action to prevent this.

1 files changed, 10 insertions, 16 deletions

diff --git a/src/nautilus-window.c b/src/nautilus-window.c
index 30299b19d..9424f154d 100644
--- a/src/nautilus-window.c
+++ b/src/nautilus-window.c
@@ -1476,29 +1476,23 @@ extra_drag_value_cb (AdwTabBar    *self,
 {
     NautilusWindowSlot *slot = NAUTILUS_WINDOW_SLOT (adw_tab_page_get_child (page));
     g_autoptr (NautilusFile) file = nautilus_file_get (nautilus_window_slot_get_location (slot));
-    GdkDragAction action;
+    GdkDragAction action = 0;
 
-    if (value == NULL)
+    if (value != NULL)
     {
-        action = 0;
-    }
-    else if (G_VALUE_HOLDS (value, GDK_TYPE_FILE_LIST))
-    {
-        GSList *file_list = g_value_get_boxed (value);
-
-        if (file_list == NULL)
+        if (G_VALUE_HOLDS (value, GDK_TYPE_FILE_LIST))
         {
-            action = 0;
+            GSList *file_list = g_value_get_boxed (value);
+            if (file_list != NULL)
+            {
+                action = nautilus_dnd_get_preferred_action (file, G_FILE (file_list->data));
+            }
         }
-        else
+        else if (G_VALUE_HOLDS (value, G_TYPE_STRING))
         {
-            action = nautilus_dnd_get_preferred_action (file, G_FILE (file_list->data));
+            action = GDK_ACTION_COPY;
         }
     }
-    else if (G_VALUE_HOLDS (value, G_TYPE_STRING))
-    {
-        action = GDK_ACTION_COPY;
-    }
 
     /* We set the preferred action on the drop from the results of this function,
      * but since we don't have access to the GtkDropTarget, we can't get the preferred