microblaze: Fix typo in exception.c

Trivial fix.

Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/c4ede6dc738c5bd7c518f3bb2c9410b15c102e20.1655299267.git.michal.simek@amd.com
diff --git a/arch/microblaze/cpu/exception.c b/arch/microblaze/cpu/exception.c
index d3640d3..9414776 100644
--- a/arch/microblaze/cpu/exception.c
+++ b/arch/microblaze/cpu/exception.c
@@ -16,7 +16,7 @@
 
 	/* loading address of exception EAR */
 	MFS(address, rear);
-	/* loading excetpion state register ESR */
+	/* loading exception state register ESR */
 	MFS(state, resr);
 	printf("Hardware exception at 0x%x address\n", address);
 	R17(address);