[patch] staging: nvec: potential NULL dereference on error path

[Dan Carpenter]

We assume nvec->rx can be NULL earlier so I have added a check here as
well.

Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/drivers/staging/nvec/nvec.c b/drivers/staging/nvec/nvec.c
index 3066ee2..c64e069 100644
--- a/drivers/staging/nvec/nvec.c
+++ b/drivers/staging/nvec/nvec.c
@@ -681,7 +681,8 @@ static irqreturn_t nvec_interrupt(int irq, void *dev)
                        dev_err(nvec->dev,
                                "RX buffer overflow on %p: "
                                "Trying to write byte %u of %u\n",
-                               nvec->rx, nvec->rx->pos, NVEC_MSG_SIZE);
+                               nvec->rx, nvec->rx ? nvec->rx->pos : -1,
+                               NVEC_MSG_SIZE);
                break;
        default:
                nvec->state = 0;
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