ptp: ocp: off by in in ptp_ocp_tod_gnss_name()

The > ARRAY_SIZE() needs to be >= ARRAY_SIZE() to prevent an out of
bounds access.

Fixes: 9f492c4c ("ptp: ocp: add TOD debug information")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Acked-by: Jonathan Lemon <jonathan.lemon@gmail.com>
Link: https://lore.kernel.org/r/20220307141318.GA18867@kiliSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/ptp/ptp_ocp.c

@@ -914,7 +914,7 @@ ptp_ocp_tod_gnss_name(int idx)
 		"ALL", "COMBINED", "GPS", "GLONASS", "GALILEO", "BEIDOU",
 		"Unknown"
 	};
-	if (idx > ARRAY_SIZE(gnss_name))
+	if (idx >= ARRAY_SIZE(gnss_name))
 		idx = ARRAY_SIZE(gnss_name) - 1;
 	return gnss_name[idx];
 }