staging: nvec: Use x instead of x != NULL to improve readability.

Use x instead of x != NULL to improve readability.
Issue identified by checkpatch.
Signed-off-by: Tom Mounet <tommounet@gmail.com>
Reviewed-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/66804898.5d0a0220.6df0f.4f0a@mx.google.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/nvec/nvec.c

@@ -300,7 +300,7 @@ int nvec_write_sync(struct nvec_chip *nvec,
 {
 	mutex_lock(&nvec->sync_write_mutex);
 
-	if (msg != NULL)
+	if (msg)
 		*msg = NULL;
 
 	nvec->sync_write_pending = (data[1] << 8) + data[0];
@@ -322,7 +322,7 @@ int nvec_write_sync(struct nvec_chip *nvec,
 
 	dev_dbg(nvec->dev, "nvec_sync_write: pong!\n");
 
-	if (msg != NULL)
+	if (msg)
 		*msg = nvec->last_sync_msg;
 	else
 		nvec_msg_free(nvec, nvec->last_sync_msg);