some fixes for repack.sh

[ecc1]

Sorry, too lazy to do a fork and PR ...

Use "grep -m 1" to find just the first DEVICE occurrence. Use "sed -E" to enable + in regular expressions. Remove quotes and $ inside $(( ... )) expressions.

diff --git a/repack.sh b/repack.sh
index 67b5f71..95509a2 100755
--- a/repack.sh
+++ b/repack.sh
@@ -125,16 +125,16 @@ grep -lR 'Firmware_Install,UEFI' "$TMP" | while IFS= read -r inf; do
        fi
        sed -i "s|{CATEGORY}|$CATEGORY|g" "$FWDIR"/*.metainfo.xml

-       DEVICE=$(grep 'Firmware_Install, *UEFI' "$inf")
+       DEVICE=$(grep -m 1 'Firmware_Install, *UEFI' "$inf")
        DEVICE=$(echo "$DEVICE" | cut -d'{' -f2 | cut -d'}' -f1)
        DEVICE=$(echo "$DEVICE" | tr '[:upper:]' '[:lower:]')
        sed -i "s|{DEVICE}|$DEVICE|g" "$FWDIR"/*.metainfo.xml

        MODELFMT=$(grep '^Device' "$TMP"/**/ReadMe.txt | cut -d':' -f2)
-       MODELFMT=$(echo "$MODELFMT" | sed 's|^ +||g' | sed 's| +$||g')
+       MODELFMT=$(echo "$MODELFMT" | sed -E 's|^ +||g' | sed -E 's| +$||g')
        sed -i "s|{MODELFMT}|$MODELFMT|g" "$FWDIR"/*.metainfo.xml

-       DRIVERVER=$(grep '^DriverVer' "$inf" | sed 's| +||g')
+       DRIVERVER=$(grep '^DriverVer' "$inf" | sed -E 's| +||g')
        DRIVERVER=$(echo "$DRIVERVER" | cut -d'=' -f2)
        MSVER=$(echo "$DRIVERVER" | cut -d',' -f2)
        sed -i "s|{MSVER}|$MSVER|g" "$FWDIR"/*.metainfo.xml
@@ -144,9 +144,9 @@ grep -lR 'Firmware_Install,UEFI' "$TMP" | while IFS= read -r inf; do
        sed -i "s|{TIMESTAMP}|$TIMESTAMP|g" "$FWDIR"/*.metainfo.xml

        UEFIVER=$(grep 'FirmwareVersion' "$inf" | cut -d',' -f5 | sed 's|\r||')
-       MAJOR=$(($(("$UEFIVER" >> 24)) & 0xff))
-       MINOR=$(($(("$UEFIVER" >> 16)) & 0xff))
-       REV=$(("$UEFIVER" & 0xffff))
+       MAJOR=$(( (UEFIVER >> 24) & 0xff ))
+       MINOR=$(( (UEFIVER >> 16) & 0xff ))
+       REV=$(( UEFIVER & 0xffff ))
        UEFIVER="$MAJOR.$MINOR.$REV"
        sed -i "s|{UEFIVER}|$UEFIVER|g" "$FWDIR"/*.metainfo.xml