cipher: remove unnecessary precondition
Already checked by parameter validation macros
diff --git a/library/cipher.c b/library/cipher.c
index 2636c09..2465536 100644
--- a/library/cipher.c
+++ b/library/cipher.c
@@ -283,12 +283,6 @@
if( ctx->cipher_info == NULL )
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
- if( operation != MBEDTLS_DECRYPT &&
- operation != MBEDTLS_ENCRYPT )
- {
- return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
- }
-
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if( ctx->psa_enabled == 1 )
{