Replace individual zeroization with memset

Signed-off-by: Paul Elliott <paul.elliott@arm.com>
diff --git a/library/psa_crypto.c b/library/psa_crypto.c
index b335aa3..1549562 100644
--- a/library/psa_crypto.c
+++ b/library/psa_crypto.c
@@ -3819,12 +3819,7 @@
 
     status = psa_driver_wrapper_aead_abort( operation );
 
-    operation->id = 0;
-    operation->nonce_set = 0;
-    operation->lengths_set = 0;
-    operation->ad_started = 0;
-    operation->body_started = 0;
-    operation->is_encrypt = 0;
+    memset( operation, 0, sizeof( psa_aead_operation_t ) );
 
     return( status );
 }