GTK save_prefs: fix a wrongly sourced error report.

After a failed rename(), we should find out what went wrong by looking
in errno itself, not in wctx->error which reported a problem in the
previous step.

1 files changed, 1 insertions, 1 deletions

diff --git a/gtk.c b/gtk.c
index fa9108c..1c96270 100644
--- a/gtk.c
+++ b/gtk.c
@@ -3079,7 +3079,7 @@ static char *save_prefs(frontend *fe)
     }
 
     if (rename(tmp_path, file_path) < 0) {
-        const char *os_err = strerror(wctx->error);
+        const char *os_err = strerror(errno);
         sprintf(err = snewn(256 + strlen(tmp_path) + strlen(file_path) +
                             strlen(os_err), char),
                 "Unable to save preferences:\n"