Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/arch/mips/include/asm/irqflags.h b/arch/mips/include/asm/irqflags.h
index 9ef3b0d..309cbcd 100644
--- a/arch/mips/include/asm/irqflags.h
+++ b/arch/mips/include/asm/irqflags.h
@@ -174,7 +174,7 @@
 	"mtc0	\\flags, $2, 1						\n"
 #elif defined(CONFIG_CPU_MIPSR2) && defined(CONFIG_IRQ_CPU)
 	/*
-	 * Slow, but doesn't suffer from a relativly unlikely race
+	 * Slow, but doesn't suffer from a relatively unlikely race
 	 * condition we're having since days 1.
 	 */
 	"	beqz	\\flags, 1f					\n"