9pfs: remove unnecessary conditionals

The VIRTIO_9P || VIRTFS && XEN condition can be computed in hw/Makefile.objs,
removing an "if" from hw/9pfs/Makefile.objs.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

hw/9pfs/Makefile.objs

-ifeq ($(call lor,$(CONFIG_VIRTIO_9P),$(CONFIG_XEN)),y)
 common-obj-y  = 9p.o 9p-util.o
 common-obj-y += 9p-local.o 9p-xattr.o
 common-obj-y += 9p-xattr-user.o 9p-posix-acl.o
 common-obj-y += coth.o cofs.o codir.o cofile.o
 common-obj-y += coxattr.o 9p-synth.o
 common-obj-y += 9p-proxy.o
-endif
 
 common-obj-$(CONFIG_XEN) += xen-9p-backend.o
 obj-$(CONFIG_VIRTIO_9P) += virtio-9p-device.o

hw/Makefile.objs

-devices-dirs-$(call land,$(CONFIG_VIRTFS),$(call lor,$(CONFIG_VIRTIO),$(CONFIG_XEN))) += 9pfs/
+devices-dirs-$(call lor,$(CONFIG_VIRTIO_9P),$(call land,$(CONFIG_VIRTFS),$(CONFIG_XEN))) += 9pfs/
 devices-dirs-$(CONFIG_SOFTMMU) += acpi/
 devices-dirs-$(CONFIG_SOFTMMU) += adc/
 devices-dirs-$(CONFIG_SOFTMMU) += audio/