Fix coding style issues

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/library/psa_crypto_driver_wrappers.c b/library/psa_crypto_driver_wrappers.c
index fd03ed2..1eb9ebe 100644
--- a/library/psa_crypto_driver_wrappers.c
+++ b/library/psa_crypto_driver_wrappers.c
@@ -501,7 +501,9 @@
     {
         if( ( drv->key_management == NULL   ) ||
             ( drv->key_management->p_export == NULL ) )
+        {
             return( PSA_ERROR_NOT_SUPPORTED );
+        }
 
         return( drv->key_management->p_export(
                      drv_context,
@@ -557,7 +559,9 @@
     {
         if( ( drv->key_management == NULL ) ||
             ( drv->key_management->p_export_public == NULL ) )
+        {
             return( PSA_ERROR_NOT_SUPPORTED );
+        }
 
         return( drv->key_management->p_export_public(
                     drv_context,