avoid m[0] being uninitialised.


Index: sys/dev/ic/arn5008.c
===================================================================
RCS file: /cvsroot/src/sys/dev/ic/arn5008.c,v
retrieving revision 1.17
diff -p -u -r1.17 arn5008.c
--- sys/dev/ic/arn5008.c	29 Jan 2020 14:09:58 -0000	1.17
+++ sys/dev/ic/arn5008.c	6 Sep 2020 10:51:59 -0000
@@ -2287,7 +2287,7 @@ ar5008_set_viterbi_mask(struct athn_soft
 	/* Compute viterbi mask. */
 	for (cur = 6100; cur >= 0; cur -= 100)
 		p[+cur / 100] = abs(cur - bin) < 75;
-	for (cur = -100; cur >= -6100; cur -= 100)
+	for (cur = 0; cur >= -6100; cur -= 100)
 		m[-cur / 100] = abs(cur - bin) < 75;
 
 	/* Write viterbi mask (XXX needs to be reworked). */