Use a seperate section for each nested struct member in INIT macro

src/libstrongswan/plugins/hmac/hmac_plugin.c

@@ -50,7 +50,11 @@ plugin_t *hmac_plugin_create()
 	private_hmac_plugin_t *this;
 
 	INIT(this,
-		.public.plugin.destroy = _destroy,
+		.public = {
+			.plugin = {
+				.destroy = _destroy,
+			},
+		},
 	);
 
 	lib->crypto->add_prf(lib->crypto, PRF_HMAC_SHA2_256,

src/libstrongswan/plugins/hmac/hmac_prf.c

@@ -108,13 +108,15 @@ hmac_prf_t *hmac_prf_create(pseudo_random_function_t algo)
 	}
 
 	INIT(this,
-		.public.prf = {
-			.get_bytes = _get_bytes,
-			.allocate_bytes = _allocate_bytes,
-			.get_block_size = _get_block_size,
-			.get_key_size = _get_key_size,
-			.set_key = _set_key,
-			.destroy = _destroy,
+		.public = {
+			.prf = {
+				.get_bytes = _get_bytes,
+				.allocate_bytes = _allocate_bytes,
+				.get_block_size = _get_block_size,
+				.get_key_size = _get_key_size,
+				.set_key = _set_key,
+				.destroy = _destroy,
+			},
 		},
 		.hmac = hmac,
 	);

src/libstrongswan/plugins/hmac/hmac_signer.c

@@ -172,14 +172,16 @@ hmac_signer_t *hmac_signer_create(integrity_algorithm_t algo)
 	}
 
 	INIT(this,
-		.public.signer = {
-			.get_signature = _get_signature,
-			.allocate_signature = _allocate_signature,
-			.verify_signature = _verify_signature,
-			.get_key_size = _get_key_size,
-			.get_block_size = _get_block_size,
-			.set_key = _set_key,
-			.destroy = _destroy,
+		.public = {
+			.signer = {
+				.get_signature = _get_signature,
+				.allocate_signature = _allocate_signature,
+				.verify_signature = _verify_signature,
+				.get_key_size = _get_key_size,
+				.get_block_size = _get_block_size,
+				.set_key = _set_key,
+				.destroy = _destroy,
+			},
 		},
 		.block_size = min(trunc, hmac->get_block_size(hmac)),
 		.hmac = hmac,