KVM: selftests: riscv: Remove unneeded semicolon

Fix the following coccicheck warnings:

./tools/testing/selftests/kvm/lib/riscv/processor.c:353:3-4: Unneeded
semicolon.
Reported-by: NAbaci Robot <abaci@linux.alibaba.com>
Signed-off-by: NJiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: NAnup Patel <anup@brainfault.org>

tools/testing/selftests/kvm/lib/riscv/processor.c

@@ -351,7 +351,7 @@ void vcpu_args_set(struct kvm_vm *vm, uint32_t vcpuid, unsigned int num, ...)
 		case 7:
 			id = RISCV_CORE_REG(regs.a7);
 			break;
-		};
+		}
 		set_reg(vm, vcpuid, id, va_arg(ap, uint64_t));
 	}