KVM: selftests: Put command line options in alphabetical order in dirty_log_perf_test

There are 13 command line options and they are not in any order. Put
them in alphabetical order to make it easy to add new options.

No functional change intended.
Signed-off-by: Vipin Sharma <vipinsh@google.com>
Reviewed-by: Wei Wang <wei.w.wang@intel.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20221103191719.1559407-3-vipinsh@google.comSigned-off-by: Sean Christopherson <seanjc@google.com>

tools/testing/selftests/kvm/dirty_log_perf_test.c

@@ -406,50 +406,52 @@ int main(int argc, char *argv[])
 
 	guest_modes_append_default();
 
-	while ((opt = getopt(argc, argv, "eghi:p:m:nb:f:v:os:x:")) != -1) {
+	while ((opt = getopt(argc, argv, "b:ef:ghi:m:nop:s:v:x:")) != -1) {
 		switch (opt) {
+		case 'b':
+			guest_percpu_mem_size = parse_size(optarg);
+			break;
 		case 'e':
 			/* 'e' is for evil. */
 			run_vcpus_while_disabling_dirty_logging = true;
 			break;
+		case 'f':
+			p.wr_fract = atoi(optarg);
+			TEST_ASSERT(p.wr_fract >= 1,
+				    "Write fraction cannot be less than one");
+			break;
 		case 'g':
 			dirty_log_manual_caps = 0;
 			break;
+		case 'h':
+			help(argv[0]);
+			break;
 		case 'i':
 			p.iterations = atoi(optarg);
 			break;
-		case 'p':
-			p.phys_offset = strtoull(optarg, NULL, 0);
-			break;
 		case 'm':
 			guest_modes_cmdline(optarg);
 			break;
 		case 'n':
 			perf_test_args.nested = true;
 			break;
-		case 'b':
-			guest_percpu_mem_size = parse_size(optarg);
+		case 'o':
+			p.partition_vcpu_memory_access = false;
 			break;
-		case 'f':
-			p.wr_fract = atoi(optarg);
-			TEST_ASSERT(p.wr_fract >= 1,
-				    "Write fraction cannot be less than one");
+		case 'p':
+			p.phys_offset = strtoull(optarg, NULL, 0);
+			break;
+		case 's':
+			p.backing_src = parse_backing_src_type(optarg);
 			break;
 		case 'v':
 			nr_vcpus = atoi(optarg);
 			TEST_ASSERT(nr_vcpus > 0 && nr_vcpus <= max_vcpus,
 				    "Invalid number of vcpus, must be between 1 and %d", max_vcpus);
 			break;
-		case 'o':
-			p.partition_vcpu_memory_access = false;
-			break;
-		case 's':
-			p.backing_src = parse_backing_src_type(optarg);
-			break;
 		case 'x':
 			p.slots = atoi(optarg);
 			break;
-		case 'h':
 		default:
 			help(argv[0]);
 			break;