scsi: fnic: Fix missing DMA mapping error in fnic_send_frame()

dma_map_XXX() can fail and should be tested for errors with
dma_mapping_error().

Fixes: a63e78e ("scsi: fnic: Add support for fabric based solicited requests and responses")
Signed-off-by: Thomas Fourier <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Karan Tilak Kumar <[email protected]>
Reviewed-by: John Menghini <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

Author: Thomas-fourier

drivers/scsi/fnic/fnic_fcs.c

@@ -636,6 +636,8 @@ static int fnic_send_frame(struct fnic *fnic, void *frame, int frame_len)
 	unsigned long flags;
 
 	pa = dma_map_single(&fnic->pdev->dev, frame, frame_len, DMA_TO_DEVICE);
+	if (dma_mapping_error(&fnic->pdev->dev, pa))
+		return -ENOMEM;
 
 	if ((fnic_fc_trace_set_data(fnic->fnic_num,
 				FNIC_FC_SEND | 0x80, (char *) frame,