qemu: Don't check for /dev/kvm presence

The file being present doesn't necessarily mean anything these
days, as it's created independently of whether the kvm module
has been loaded[1]; moreover, we're already gathering all the
information we need through QMP, so poking the filesystem at
all is entirely unnecessary.

[1] https://github.com/systemd/systemd/commit/d35d6249d5a7ed3228Signed-off-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NJiri Denemark <jdenemar@redhat.com>

src/qemu/qemu_capabilities.c

@@ -834,9 +834,8 @@ virQEMUCapsInitGuestFromBinary(virCapsPtr caps,
     if (!binary)
         return 0;
 
-    if (virFileExists("/dev/kvm") &&
-        (virQEMUCapsGet(qemubinCaps, QEMU_CAPS_KVM) ||
-         kvmbin))
+    if (virQEMUCapsGet(qemubinCaps, QEMU_CAPS_KVM) ||
+        kvmbin)
         haskvm = true;
 
     if (virQEMUCapsGetMachineTypesCaps(qemubinCaps, &nmachines, &machines) < 0)