spelling fixes: arch/alpha/

Spelling fixes in arch/alpha/.

Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
Signed-off-by: Adrian Bunk <bunk@kernel.org>
diff --git a/arch/alpha/kernel/err_titan.c b/arch/alpha/kernel/err_titan.c
index 543d96d..6f38678 100644
--- a/arch/alpha/kernel/err_titan.c
+++ b/arch/alpha/kernel/err_titan.c
@@ -591,7 +591,7 @@
 		(struct el_PRIVATEER_envdata_mcheck *)
 		((unsigned long)mchk_header + mchk_header->sys_offset);
 
-	/* TODO - catagorize errors, for now, no error */
+	/* TODO - categorize errors, for now, no error */
 
 	if (!print)
 		return status;