virQEMUCapsHasPCIMultiBus: Fix @def type

This function only queries domain @def. It doesn't change it.
Therefore it should take const pointer.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

src/qemu/qemu_capabilities.c

@@ -2398,7 +2398,7 @@ virQEMUCapsGet(virQEMUCapsPtr qemuCaps,
 
 
 bool virQEMUCapsHasPCIMultiBus(virQEMUCapsPtr qemuCaps,
-                               virDomainDefPtr def)
+                               const virDomainDef *def)
 {
     /* x86_64 and i686 support PCI-multibus on all machine types
      * since forever */

src/qemu/qemu_capabilities.h

@@ -456,7 +456,7 @@ bool virQEMUCapsGet(virQEMUCapsPtr qemuCaps,
                     virQEMUCapsFlags flag);
 
 bool virQEMUCapsHasPCIMultiBus(virQEMUCapsPtr qemuCaps,
-                               virDomainDefPtr def);
+                               const virDomainDef *def);
 
 bool virQEMUCapsSupportsVmport(virQEMUCapsPtr qemuCaps,
                                const virDomainDef *def);