x86: Fix common misspellings

They were generated by 'codespell' and then manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
Cc: trivial@kernel.org
LKML-Reference: <1300389856-1099-3-git-send-email-lucas.demarchi@profusion.mobi>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/kernel/irq_32.c

@@ -172,7 +172,7 @@ asmlinkage void do_softirq(void)
 
 		call_on_stack(__do_softirq, isp);
 		/*
-		 * Shouldnt happen, we returned above if in_interrupt():
+		 * Shouldn't happen, we returned above if in_interrupt():
 		 */
 		WARN_ON_ONCE(softirq_count());
 	}