KVM: release anon file in failure path of vm creation

The failure of create debugfs of VM will return directly without release
the anon file. It will leak memory and file descriptors, even through
be not serious.
Signed-off-by: NLiu Shuo <shuo.a.liu@intel.com>
Fixes: 536a6f88Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

virt/kvm/kvm_main.c

@@ -49,6 +49,7 @@
 #include <linux/slab.h>
 #include <linux/sort.h>
 #include <linux/bsearch.h>
+#include <linux/syscalls.h>
 
 #include <asm/processor.h>
 #include <asm/io.h>
@@ -3069,6 +3070,7 @@ static int kvm_dev_ioctl_create_vm(unsigned long type)
 
 	if (kvm_create_vm_debugfs(kvm, r) < 0) {
 		kvm_put_kvm(kvm);
+		sys_close(r);
 		return -ENOMEM;
 	}