assoc_array: fix the return value in assoc_array_insert_mid_shortcut()

Returning the edit variable is redundant because it is dereferenced right
before it is returned.  It would be better to return true.

Found by Linux Verification Center (linuxtesting.org) with Svace.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Roman Smirnov <[email protected]>
Reviewed-by: Sergey Shtylyov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: RSmirnov512

lib/assoc_array.c

@@ -938,7 +938,7 @@ static bool assoc_array_insert_mid_shortcut(struct assoc_array_edit *edit,
 		edit->leaf_p = &new_n0->slots[0];
 
 	pr_devel("<--%s() = ok [split shortcut]\n", __func__);
-	return edit;
+	return true;
 }
 
 /**