ixgbe: don't check NULL for debugfs_remove_recursive

The debugfs_remove_recursive function is NULL-safe, so we don't need to
check here ourselves.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_debugfs.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_debugfs.c
index 472b0f4..5e2c1e3 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_debugfs.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_debugfs.c
@@ -253,8 +253,7 @@
  **/
 void ixgbe_dbg_adapter_exit(struct ixgbe_adapter *adapter)
 {
-	if (adapter->ixgbe_dbg_adapter)
-		debugfs_remove_recursive(adapter->ixgbe_dbg_adapter);
+	debugfs_remove_recursive(adapter->ixgbe_dbg_adapter);
 	adapter->ixgbe_dbg_adapter = NULL;
 }