PCI: endpoint: pci-epf-test: Set dma_chan_rx pointer to NULL on error

If dma_chan_tx allocation fails, set dma_chan_rx to NULL after it is
freed.

Link: https://lore.kernel.org/r/[email protected]
Fixes: 8353813 ("PCI: endpoint: Enable DMA tests for endpoints with DMA capabilities")
Signed-off-by: Mohamed Khalfella <[email protected]>
[kwilczynski: commit log]
Signed-off-by: Krzysztof Wilczyński <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Niklas Cassel <[email protected]>
Reviewed-by: Manivannan Sadhasivam <[email protected]>

Author: khalfella

drivers/pci/endpoint/functions/pci-epf-test.c

@@ -251,7 +251,7 @@ static int pci_epf_test_init_dma_chan(struct pci_epf_test *epf_test)
 
 fail_back_rx:
 	dma_release_channel(epf_test->dma_chan_rx);
-	epf_test->dma_chan_tx = NULL;
+	epf_test->dma_chan_rx = NULL;
 
 fail_back_tx:
 	dma_cap_zero(mask);