[media] staging: atomisp: Do not call dev_warn with a NULL device

Do not call dev_warn with a NULL device, this silence the following 2
warnings:

[   14.392194] (NULL device *): Failed to find gmin variable gmin_V2P8GPIO
[   14.392257] (NULL device *): Failed to find gmin variable gmin_V1P8GPIO

We could switch to using pr_warn for dev == NULL instead, but as comments
in the source indicate, the check for these 2 special gmin variables with
a NULL device is a workaround for 2 specific evaluation boards, so
completely silencing the missing warning for these actually is a good
thing.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/staging/media/atomisp/platform/intel-mid/atomisp_gmin_platform.c

@@ -704,7 +704,7 @@ int gmin_get_config_var(struct device *dev, const char *var, char *out,
 	if (ret == 0) {
 		memcpy(out, ev->var.Data, ev->var.DataSize);
 		*out_len = ev->var.DataSize;
-	} else {
+	} else if (dev) {
 		dev_warn(dev, "Failed to find gmin variable %s\n", var8);
 	}