util/spkmodem-recv: don't exit in print_stats

i treated ftell errors as fatal, but if fttell fails
with ESPIPE, and someone's using -d, the program may
exit immediately, even though there's no problem.

instead, skip printing the offset (basically no debug).

this fixes a bug that i introduced myself, when i forked
this code, because i added that error check; the GNU
code didn't have any check whatsoever.

Signed-off-by: Leah Rowe <leah@libreboot.org>

util/spkmodem_recv/spkmodem-recv.c

@@ -239,8 +239,14 @@ print_stats(struct decoder_state *st)
 	long pos;
 
 	pos = ftell(stdin);
-	if (pos == -1)
-		err(errno, "ftell");
+
+	if (pos == -1) {
+		printf("%d %d %d\n",
+		    st->freq_data,
+		    st->freq_separator,
+		    FREQ_DATA_THRESHOLD);
+		return;
+	}
 
 	printf("%d %d %d @%ld\n",
 	    st->freq_data,