Fix pure C compilation

src/msgpack/sbuffer.h

@@ -69,12 +69,13 @@ static inline int msgpack_sbuffer_write(void* data, const char* buf, size_t len)
 	msgpack_sbuffer* sbuf = (msgpack_sbuffer*)data;
 
 	if(sbuf->alloc - sbuf->size < len) {
+		void* tmp;
 		size_t nsize = (sbuf->alloc) ?
 				sbuf->alloc * 2 : MSGPACK_SBUFFER_INIT_SIZE;
 
 		while(nsize < sbuf->size + len) { nsize *= 2; }
 
-		void* tmp = realloc(sbuf->data, nsize);
+		tmp = realloc(sbuf->data, nsize);
 		if(!tmp) { return -1; }
 
 		sbuf->data = (char*)tmp;

src/msgpack/zone.h

@@ -90,13 +90,14 @@ void* msgpack_zone_malloc_expand(msgpack_zone* zone, size_t size);
 
 void* msgpack_zone_malloc_no_align(msgpack_zone* zone, size_t size)
 {
+	char* ptr;
 	msgpack_zone_chunk_list* cl = &zone->chunk_list;
 
 	if(zone->chunk_list.free < size) {
 		return msgpack_zone_malloc_expand(zone, size);
 	}
 
-	char* ptr = cl->ptr;
+	ptr = cl->ptr;
 	cl->free -= size;
 	cl->ptr  += size;