net: ipa: skip some cleanup for unused transactions

In gsi_trans_free(), there's no point in ipa_gsi_trans_release() if
a transaction is unused.  No used TREs means no IPA layer resources
to clean up.  So only call ipa_gsi_trans_release() if at least one
TRE was used.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ipa/gsi_trans.c

@@ -404,6 +404,7 @@ void gsi_trans_free(struct gsi_trans *trans)
 	if (!last)
 		return;
 
+	if (trans->used_count)
 		ipa_gsi_trans_release(trans);
 
 	/* Releasing the reserved TREs implicitly frees the sgl[] and