live-netdev: unify coding style and drop noop $NETDEV assignment

Upstream uses tabs instead of whitespace and if\nthen etc coding style,
while I personally don't like this, let's keep coding style consistent,
to make synching and contributions towards upstream easier.

While at it, the NETDEV="$NETDEV" is a noop, as the variable is assigned
to itself, so drop it.

components/9990-select-eth-device.sh

@@ -78,31 +78,32 @@ Select_eth_device ()
 		# If user force to use specific device, write it
 		for ARGUMENT in ${LIVE_BOOT_CMDLINE}
 		do
-                        case "${ARGUMENT}" in
-                          live-netdev=*)
-                            NETDEV="${ARGUMENT#live-netdev=}"
-
-                            # Check if NETDEV is a valid MAC address
-                            if echo "$NETDEV" | grep -Eq '^[0-9A-Fa-f]{2}[:-]([0-9A-Fa-f]{2}[:-]){4}[0-9A-Fa-f]{2}$'; then
-                              echo "NETDEV is a valid MAC address."
-
-                              # Retrieve the device name associated with the MAC address
-                              DEVICE_NAME=$(ip -o link | awk -v mac="$NETDEV" '$0 ~ mac{print substr($2, 1, length($2)-1)}')
-                              if [ -n "$DEVICE_NAME" ]; then
-                                echo "Device name for MAC address $NETDEV is $DEVICE_NAME."
-                                NETDEV="$DEVICE_NAME"
-                              fi
-                            else
-                              echo "NETDEV is not a valid MAC address. Assuming it is a device name."
-                              # Assign NETDEV directly to $NETDEV
-                              NETDEV="$NETDEV"
-                            fi
-                            echo "DEVICE=$NETDEV" >> /conf/param.conf
-                            echo "Found live-netdev parameter, forcing it to use network device $NETDEV."
-                            Wait_for_carrier "$NETDEV"
-                            return
-                            ;;
-                        esac
+			case "${ARGUMENT}" in
+				live-netdev=*)
+				NETDEV="${ARGUMENT#live-netdev=}"
+
+				# Check if NETDEV is a valid MAC address
+				if echo "$NETDEV" | grep -Eq '^[0-9A-Fa-f]{2}[:-]([0-9A-Fa-f]{2}[:-]){4}[0-9A-Fa-f]{2}$'
+				then
+					echo "NETDEV is a valid MAC address."
+
+					# Retrieve the device name associated with the MAC address
+					DEVICE_NAME=$(ip -o link | awk -v mac="$NETDEV" '$0 ~ mac{print substr($2, 1, length($2)-1)}')
+					if [ -n "$DEVICE_NAME" ]
+					then
+						echo "Device name for MAC address $NETDEV is $DEVICE_NAME."
+						NETDEV="$DEVICE_NAME"
+					fi
+				else
+					echo "NETDEV is not a valid MAC address. Assuming it is a device name."
+				fi
+
+				echo "DEVICE=$NETDEV" >> /conf/param.conf
+				echo "Found live-netdev parameter, forcing it to use network device $NETDEV."
+				Wait_for_carrier "$NETDEV"
+				return
+				;;
+			esac
 		done
 	else
 		l_interfaces="$DEVICE"