base-files: ensure to return a match for non-UBI partitions only.

MTD and UBI use separate tools.

iopsys-brcm63xx-arm/base-files/lib/upgrade/broadcom.sh

@@ -16,8 +16,16 @@ bcm_get_chip_id() {
 
 
 #--------------------------------------------------------------
+# Return the string integer of the MTD device
+# having name "$1" which is not an UBI volume.
 bcm_find_mtd() {
-	local part=$(awk -F: "/\"$1\"/ { print \$1 }" /proc/mtd)
+	local part
+
+	if [ -e "/sys/class/ubi/ubi0" ]; then										# Ensure the device is not an UBI MTD.
+		grep -q "$1" /sys/class/ubi/*/name && return 0
+	fi
+
+	part=$(awk -F: "/\"$1\"/ { print \$1 }" /proc/mtd)
 	echo ${part##mtd}
 }