phy: marvell: Fix off by 1 limit checks

The limit checks in get_speed_string and get_type_string are off by 1 as
they do not account for the maximum index into an array that can be used
is 1 less than the number of elements in that array. Adjust the limit
checks to allow for this.

This issue was found by Smatch.

Signed-off-by: Andrew Goodbody <andrew.goodbody@linaro.org>
Reviewed-by: Stefan Roese <stefan.roese@mailbox.org>

drivers/phy/marvell/comphy_core.c

@@ -28,7 +28,7 @@ static const char *get_speed_string(u32 speed)
 		"10.3125 Gbps"
 	};
 
-	if (speed < 0 || speed > COMPHY_SPEED_MAX)
+	if (speed < 0 || speed >= COMPHY_SPEED_MAX)
 		return "invalid";
 
 	return speed_strings[speed];
@@ -44,7 +44,7 @@ static const char *get_type_string(u32 type)
 		"IGNORE"
 	};
 
-	if (type < 0 || type > COMPHY_TYPE_MAX)
+	if (type < 0 || type >= COMPHY_TYPE_MAX)
 		return "invalid";
 
 	return type_strings[type];