staging: goldfish: Fix NULL comparison style

Fixed NULL comparison style as suggested by checkpatch.pl with --strict
option.

Signed-off-by: Ravi Teja Darbha <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/goldfish/goldfish_nand.c

···
 	struct cmd_params *cps = nand->cmd_params;
 	unsigned char __iomem  *base = nand->base;
 
-	if (cps == NULL)
+	if (!cps)
 		return -1;
 
 	switch (cmd) {
···
 	unsigned char __iomem  *base;
 
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (r == NULL)
+	if (!r)
 		return -ENODEV;
 
 	base = devm_ioremap(&pdev->dev, r->start, PAGE_SIZE);