Switch to the new code style

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/tests/include/alt-dummy/gcm_alt.h b/tests/include/alt-dummy/gcm_alt.h
index 94986ff..7be5b62 100644
--- a/tests/include/alt-dummy/gcm_alt.h
+++ b/tests/include/alt-dummy/gcm_alt.h
@@ -19,8 +19,7 @@
 #ifndef GCM_ALT_H
 #define GCM_ALT_H
 
-typedef struct mbedtls_gcm_context
-{
+typedef struct mbedtls_gcm_context {
     int dummy;
 }
 mbedtls_gcm_context;