MIPS: ralink: Fix request_mem_region error handling

request_mem_region returns a NULL pointer on error, comparing it
against a number results in a warning:

arch/mips/ralink/of.c: In function 'plat_of_remap_node':
arch/mips/ralink/of.c:45:15: error: ordered comparison of pointer with integer zero [-Werror=extra]
arch/mips/ralink/irq.c: In function 'intc_of_init':
arch/mips/ralink/irq.c:167:15: error: ordered comparison of pointer with integer zero [-Werror=extra]
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: John Crispin <john@phrozen.org>
Cc: Tobias Wolf <dev-NTEO@vplace.de>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/15045/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/ralink/irq.c

@@ -163,8 +163,8 @@ static int __init intc_of_init(struct device_node *node,
 	if (of_address_to_resource(node, 0, &res))
 		panic("Failed to get intc memory range");
 
-	if (request_mem_region(res.start, resource_size(&res),
-				res.name) < 0)
+	if (!request_mem_region(res.start, resource_size(&res),
+				res.name))
 		pr_err("Failed to request intc memory");
 
 	rt_intc_membase = ioremap_nocache(res.start,

arch/mips/ralink/of.c

@@ -40,9 +40,9 @@ __iomem void *plat_of_remap_node(const char *node)
 	if (of_address_to_resource(np, 0, &res))
 		panic("Failed to get resource for %s", node);
 
-	if ((request_mem_region(res.start,
+	if (!request_mem_region(res.start,
 				resource_size(&res),
-				res.name) < 0))
+				res.name))
 		panic("Failed to request resources for %s", node);
 
 	return ioremap_nocache(res.start, resource_size(&res));