crypto: atmel-aes - Add missing break to atmel_aes_reg_name

The debug function atmel_aes_reg_name was missing a break for
AES_GCMHR.
Reported-by: NDavid Binderman <dcb314@hotmail.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/atmel-aes.c

@@ -280,6 +280,7 @@ static const char *atmel_aes_reg_name(u32 offset, char *tmp, size_t sz)
 	case AES_GCMHR(2):
 	case AES_GCMHR(3):
 		snprintf(tmp, sz, "GCMHR[%u]", (offset - AES_GCMHR(0)) >> 2);
+		break;
 
 	default:
 		snprintf(tmp, sz, "0x%02x", offset);