Fix edgepaint -? to actually print usage instead of error on macOS

Towards https://gitlab.com/graphviz/graphviz/-/issues/1852.

diff --git a/cmd/edgepaint/edgepaintmain.c b/cmd/edgepaint/edgepaintmain.c
index 18ab2ec58e7d63713a7c700dcf49f266a20ef2e2..3473faab4c9cfd439267a1ac6b50e8954d2d5576 100644 (file)
--- a/cmd/edgepaint/edgepaintmain.c
+++ b/cmd/edgepaint/edgepaintmain.c
@@ -180,7 +180,7 @@ static void init(int argc, char *argv[], real *angle, real *accuracy, char **inf
       outfile = openFile(optarg, "w", CmdName);
       break;
     case '?':
-      if (optopt == '\0')
+      if (optopt == '\0' || optopt == '?')
        usage(cmd, 0);
       else {
        fprintf(stderr, "option -%c unrecognized\n",