utils: use strtol instead of atoi

HEX format is friendly to iSCSI utils, for example:
./iscsi-inq -e 0x1 -c 0xb1 iscsi://...

atoi supports decimal only, this example does not work.
Use strtol(nptr, NULL, 0) to auto-detect format, then this works fine.

Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>

utils/iscsi-swp.c

@@ -93,7 +93,7 @@ int main(int argc, char *argv[])
 			show_usage = 1;
 			break;
 		case 'd':
-			debug = atoi(optarg);
+			debug = strtol(optarg, NULL, 0);
 			break;
 		case 'i':
 			initiator = optarg;