KVM: remove redundant assignment to variable r

The variable r is being assigned  with a value that is never read
and it is being updated later with a new value.  The initialization is
redundant and can be removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Message-Id: <20200410113526.13822-1-colin.king@canonical.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

virt/kvm/kvm_main.c

@@ -3160,7 +3160,6 @@ static long kvm_vcpu_ioctl(struct file *filp,
 	case KVM_SET_REGS: {
 		struct kvm_regs *kvm_regs;
 
-		r = -ENOMEM;
 		kvm_regs = memdup_user(argp, sizeof(*kvm_regs));
 		if (IS_ERR(kvm_regs)) {
 			r = PTR_ERR(kvm_regs);