Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/include/linux/amba/clcd.h b/include/linux/amba/clcd.h
index 24d26ef..e82e3ee 100644
--- a/include/linux/amba/clcd.h
+++ b/include/linux/amba/clcd.h
@@ -136,7 +136,7 @@
 	int	(*check)(struct clcd_fb *fb, struct fb_var_screeninfo *var);
 
 	/*
-	 * Compulsary.  Decode fb->fb.var into regs->*.  In the case of
+	 * Compulsory.  Decode fb->fb.var into regs->*.  In the case of
 	 * fixed timing, set regs->* to the register values required.
 	 */
 	void	(*decode)(struct clcd_fb *fb, struct clcd_regs *regs);