tulip: Move TulipState typedef to header

Move typedef closer to the type check macros, to make it easier
to convert the code to OBJECT_DEFINE_TYPE() in the future.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Tested-By: Roman Bolshakov <r.bolshakov@yadro.com>
Message-Id: <20200825192110.3528606-16-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

hw/net/tulip.c

@@ -18,7 +18,7 @@
 #include "trace.h"
 #include "net/eth.h"
 
-typedef struct TULIPState {
+struct TULIPState {
     PCIDevice dev;
     MemoryRegion io;
     MemoryRegion memory;
@@ -44,7 +44,7 @@ typedef struct TULIPState {
 
     uint32_t rx_status;
     uint8_t filter[16][6];
-} TULIPState;
+};
 
 static const VMStateDescription vmstate_pci_tulip = {
     .name = "tulip",

hw/net/tulip.h

@@ -5,6 +5,7 @@
 #include "net/net.h"
 
 #define TYPE_TULIP "tulip"
+typedef struct TULIPState TULIPState;
 #define TULIP(obj) OBJECT_CHECK(TULIPState, (obj), TYPE_TULIP)
 
 #define CSR(_x) ((_x) << 3)