powerpc: fix a file leak in kvm_vcpu_ioctl_enable_cap()

missing fdput() on one of the failure exits

Fixes: eacc56bb # v5.2
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

arch/powerpc/kvm/powerpc.c

@@ -1984,8 +1984,10 @@ static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
 			break;
 
 		r = -ENXIO;
-		if (!xive_enabled())
+		if (!xive_enabled()) {
+			fdput(f);
 			break;
+		}
 
 		r = -EPERM;
 		dev = kvm_device_from_filp(f.file);