qemu: different declarations for the same method

Recently, this warning is appearing while libvirt is being compiled:
Function 'qemuAssignDeviceDiskAlias' argument order different:
declaration 'vmdef, def' definition 'def, disk'

This commit change the default declaration for qemuAssignDeviceDiskAlias
specified at src/qemu/qemu_alias.c.
Signed-off-by: NJulio Faracco <jcfaracco@gmail.com>
Reviewed-by: NAndrea Bolognani <abologna@redhat.com>

src/qemu/qemu_alias.h

@@ -38,8 +38,8 @@ int qemuAssignDeviceControllerAlias(virDomainDefPtr domainDef,
                                     virQEMUCapsPtr qemuCaps,
                                     virDomainControllerDefPtr controller);
 
-int qemuAssignDeviceDiskAlias(virDomainDefPtr vmdef,
-                              virDomainDiskDefPtr def);
+int qemuAssignDeviceDiskAlias(virDomainDefPtr def,
+                              virDomainDiskDefPtr disk);
 
 int qemuAssignDeviceHostdevAlias(virDomainDefPtr def,
                                  char **alias,