pci: msix: move 'MSIX_CAP_LENGTH' to header file

'MSIX_CAP_LENGTH' is defined in two .c file. Move it
to hw/pci/msix.h file to reduce duplicated code.

CC: qemu-trivial@nongnu.org
Signed-off-by: Li Qiang <liq3ea@163.com>
Message-Id: <20190521151543.92274-5-liq3ea@163.com>
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

hw/pci/msix.c

@@ -24,8 +24,6 @@
 #include "qapi/error.h"
 #include "trace.h"
 
-#define MSIX_CAP_LENGTH 12
-
 /* MSI enable bit and maskall bit are in byte 1 in FLAGS register */
 #define MSIX_CONTROL_OFFSET (PCI_MSIX_FLAGS + 1)
 #define MSIX_ENABLE_MASK (PCI_MSIX_FLAGS_ENABLE >> 8)

hw/vfio/pci.c

@@ -35,8 +35,6 @@
 #include "trace.h"
 #include "qapi/error.h"
 
-#define MSIX_CAP_LENGTH 12
-
 #define TYPE_VFIO_PCI "vfio-pci"
 #define PCI_VFIO(obj)    OBJECT_CHECK(VFIOPCIDevice, obj, TYPE_VFIO_PCI)
 

include/hw/pci/msix.h

@@ -4,6 +4,8 @@
 #include "qemu-common.h"
 #include "hw/pci/pci.h"
 
+#define MSIX_CAP_LENGTH 12
+
 void msix_set_message(PCIDevice *dev, int vector, MSIMessage msg);
 MSIMessage msix_get_message(PCIDevice *dev, unsigned int vector);
 int msix_init(PCIDevice *dev, unsigned short nentries,