KVM: selftests: Add missing break between -e and -g option in dirty_log_perf_test

Passing -e option (Run VCPUs while dirty logging is being disabled) in
dirty_log_perf_test also unintentionally enables -g (Do not enable
KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2). Add break between two switch case
logic.

Fixes: cfe12e64b0 ("KVM: selftests: Add an option to run vCPUs while disabling dirty logging")
Signed-off-by: Vipin Sharma <vipinsh@google.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20221103191719.1559407-2-vipinsh@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

tools/testing/selftests/kvm/dirty_log_perf_test.c

@@ -411,6 +411,7 @@ int main(int argc, char *argv[])
 		case 'e':
 			/* 'e' is for evil. */
 			run_vcpus_while_disabling_dirty_logging = true;
+			break;
 		case 'g':
 			dirty_log_manual_caps = 0;
 			break;