Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/arch/arm/mach-omap2/gpio.c b/arch/arm/mach-omap2/gpio.c
index 413de18..9529842 100644
--- a/arch/arm/mach-omap2/gpio.c
+++ b/arch/arm/mach-omap2/gpio.c
@@ -82,7 +82,7 @@
 	kfree(pdata);
 
 	if (IS_ERR(od)) {
-		WARN(1, "Cant build omap_device for %s:%s.\n",
+		WARN(1, "Can't build omap_device for %s:%s.\n",
 					name, oh->name);
 		return PTR_ERR(od);
 	}