Improve parameter validation in mbedtls_gcm_free()
diff --git a/library/gcm.c b/library/gcm.c
index 3e41eda..675926a 100644
--- a/library/gcm.c
+++ b/library/gcm.c
@@ -541,9 +541,8 @@
 
 void mbedtls_gcm_free( mbedtls_gcm_context *ctx )
 {
-    if( ctx == NULL ) {
+    if( ctx == NULL )
         return;
-    }
     mbedtls_cipher_free( &ctx->cipher_ctx );
     mbedtls_platform_zeroize( ctx, sizeof( mbedtls_gcm_context ) );
 }