check for root after processing args so non-root can run --help

--- a/src/oftpd.c
+++ b/src/oftpd.c
@@ -56,12 +56,6 @@ int main(int argc, char *argv[])
         exe_name = argv[0];
     }
 
-    /* verify we're running as root */
-    if (geteuid() != 0) {
-        fprintf(stderr, "%s: program needs root permission to run\n", exe_name);
-        exit(1);
-    }
-
     /* default command-line arguments */
     port = FTP_PORT;
     user_ptr = NULL;
@@ -187,6 +181,12 @@ int main(int argc, char *argv[])
         exit(1);
     }
 
+    /* verify we're running as root */
+    if (geteuid() != 0) {
+        fprintf(stderr, "%s: program needs root permission to run\n", exe_name);
+        exit(1);
+    }
+
     /* become a daemon */
     if (detach) {
         daemonize();