wslog: Print to stderr with a null error handler

For some programs (e.g: unit tests) we want to init the logging
subsystem but having to pass an error output handler is overkill
and annoying.

In that case with a NULL handler printing to stderr by default is
almost certainly the best thing to do.

1 files changed, 4 insertions, 4 deletions

diff --git a/wsutil/wslog.c b/wsutil/wslog.c
index a6482e6e7c..bbb9a8c189 100644
--- a/wsutil/wslog.c
+++ b/wsutil/wslog.c
@@ -323,11 +323,11 @@ static void print_err(void (*vcmdarg_err)(const char *, va_list ap),
 {
     va_list ap;
 
-    if (vcmdarg_err == NULL)
-        return;
-
     va_start(ap, fmt);
-    vcmdarg_err(fmt, ap);
+    if (vcmdarg_err)
+        vcmdarg_err(fmt, ap);
+    else
+        vfprintf(stderr, fmt, ap);
     va_end(ap);
     if (exit_failure != LOG_ARGS_NOEXIT)
         exit(exit_failure);