ARM: omap2: gpmc-onenand: Print something useful on CS request failure

If CS request fails the current error message is rather unhelpful.
Fix it by printing the failing chip select and the error code.
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Reviewed-by: Jon Hunter <jon-hunter@ti.com>
Signed-off-by: Jon Hunter <jon-hunter@ti.com>

arch/arm/mach-omap2/gpmc-onenand.c

@@ -379,7 +379,8 @@ void gpmc_onenand_init(struct omap_onenand_platform_data *_onenand_data)
 	err = gpmc_cs_request(gpmc_onenand_data->cs, ONENAND_IO_SIZE,
 				(unsigned long *)&gpmc_onenand_resource.start);
 	if (err < 0) {
-		pr_err("%s: Cannot request GPMC CS\n", __func__);
+		pr_err("%s: Cannot request GPMC CS %d, error %d\n",
+		       __func__, gpmc_onenand_data->cs, err);
 		return;
 	}