drm/xe/hwmon: Prevent unintended VRAM channel creation

Remove the unnecessary VRAM channel entry introduced in xe_hwmon_channel.
Without this, adding any new hwmon channel causes extra VRAM channel
to appear. This remained unnoticed earlier because VRAM was the
final xe hwmon channel.

v2: Use MAX_VRAM_CHANNELS with in_range() instead of
    CHANNEL_VRAM_N_MAX. (Raag)

Fixes: 49a4983 ("drm/xe/hwmon: Expose individual VRAM channel temperature")
Signed-off-by: Karthik Poosa <karthik.poosa@intel.com>
Reviewed-by: Raag Jadav <raag.jadav@intel.com>
Link: https://patch.msgid.link/20260206081655.2115439-1-karthik.poosa@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
(cherry picked from commit 48eb073)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

Author: kpoosa

drivers/gpu/drm/xe/xe_hwmon.c

@@ -48,7 +48,7 @@ enum xe_hwmon_channel {
 	CHANNEL_MCTRL,
 	CHANNEL_PCIE,
 	CHANNEL_VRAM_N,
-	CHANNEL_VRAM_N_MAX = CHANNEL_VRAM_N + MAX_VRAM_CHANNELS,
+	CHANNEL_VRAM_N_MAX = CHANNEL_VRAM_N + MAX_VRAM_CHANNELS - 1,
 	CHANNEL_MAX,
 };
 
@@ -264,7 +264,7 @@ static struct xe_reg xe_hwmon_get_reg(struct xe_hwmon *hwmon, enum xe_hwmon_reg
 				return BMG_PACKAGE_TEMPERATURE;
 			else if (channel == CHANNEL_VRAM)
 				return BMG_VRAM_TEMPERATURE;
-			else if (in_range(channel, CHANNEL_VRAM_N, CHANNEL_VRAM_N_MAX))
+			else if (in_range(channel, CHANNEL_VRAM_N, MAX_VRAM_CHANNELS))
 				return BMG_VRAM_TEMPERATURE_N(channel - CHANNEL_VRAM_N);
 		} else if (xe->info.platform == XE_DG2) {
 			if (channel == CHANNEL_PKG)
@@ -1427,7 +1427,7 @@ static int xe_hwmon_read_label(struct device *dev,
 			*str = "mctrl";
 		else if (channel == CHANNEL_PCIE)
 			*str = "pcie";
-		else if (in_range(channel, CHANNEL_VRAM_N, CHANNEL_VRAM_N_MAX))
+		else if (in_range(channel, CHANNEL_VRAM_N, MAX_VRAM_CHANNELS))
 			*str = hwmon->temp.vram_label[channel - CHANNEL_VRAM_N];
 		return 0;
 	case hwmon_power: