maint: don't emit an extra newline in each of two diagnostics

* src/shuf.c (main): Remove a stray newline in a diagnostic.
* src/od.c (main): Likewise.
Detected via these:
  git grep -A1 'error *(.*,$' | grep -C1 '\\n"[,)]'
  git grep 'error *(.*;$' | grep '\\n"[,)]'

1 files changed, 1 insertions, 1 deletions

diff --git a/src/od.c b/src/od.c
index 964552d97..45087253d 100644
--- a/src/od.c
+++ b/src/od.c
@@ -1800,7 +1800,7 @@ it must be one character from [doxn]"),
       if (traditional && 1 < n_files)
         {
           error (0, 0, _("extra operand %s"), quote (argv[optind + 1]));
-          error (0, 0, "%s\n",
+          error (0, 0, "%s",
                  _("compatibility mode supports at most one file"));
           usage (EXIT_FAILURE);
         }