RISC-V: KVM: Fix indentation in kvm_riscv_vcpu_set_reg_csr()

The indentation of "break" in kvm_riscv_vcpu_set_reg_csr() is
inconsistent hence let us fix it.

Fixes: c04913f2

 ("RISCV: KVM: Add sstateen0 to ONE_REG")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202312190719.kBuYl6oJ-lkp@intel.com/
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Signed-off-by: Anup Patel <anup@brainfault.org>