Simplify camellia error conversion macros

Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
diff --git a/library/psa_crypto.c b/library/psa_crypto.c
index 028bdaa..2b6c8d4 100644
--- a/library/psa_crypto.c
+++ b/library/psa_crypto.c
@@ -175,9 +175,7 @@
 #endif
 
 #if defined(PSA_WANT_KEY_TYPE_CAMELLIA)
-#if defined(MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA)
         case MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA:
-#endif
         case MBEDTLS_ERR_CAMELLIA_INVALID_INPUT_LENGTH:
             return PSA_ERROR_NOT_SUPPORTED;
 #endif