Fix SC2004 warnings

scripts/qgis_srs.sh

@@ -201,7 +201,7 @@ for i in $(awk 'NR>1' ${gdal_share}/pcs.csv | cut -d, -f1); do
 
   if [ -n "$raw" ]; then
 
-   no=$(($no + 1))
+   no=$((no + 1))
    name=$(echo $raw | sed 's/^# //' | grep -o "^.\{1,\} <[[:digit:]]\{1,\}>" | sed 's/ <[[:digit:]]\{1,\}>//' | sed "s/'/''/g")
    proj=$(echo $raw | grep -o "+proj=[^[:space:]]\{1,\}" | cut -d"=" -f2)
    ellps=$(echo $raw | grep -o "+ellps=[^[:space:]]\{1,\}" | cut -d"=" -f2)
@@ -224,7 +224,7 @@ for i in $(awk 'NR>1' ${gdal_share}/gcs.csv | cut -d, -f1); do
 
   if [ -n "$raw" ]; then
 
-   no=$(($no + 1))
+   no=$((no + 1))
    name=$(echo $raw | sed 's/^# //' | grep -o "^.\{1,\} <[[:digit:]]\{1,\}>" | sed 's/ <[[:digit:]]\{1,\}>//' | sed "s/'/''/g")
    proj=$(echo $raw | grep -o "+proj=[^[:space:]]\{1,\}" | cut -d"=" -f2)
    ellps=$(echo $raw | grep -o "+ellps=[^[:space:]]\{1,\}" | cut -d"=" -f2)

tests/code_layout/test_shellcheck.sh

@@ -5,7 +5,7 @@
 DIR=$(git rev-parse --show-toplevel)
 
 pushd ${DIR} > /dev/null || exit
-result=$(shellcheck -e SC2016,SC2015,SC2086,SC2002,SC1117,SC2154,SC2076,SC2046,SC1090,SC2038,SC2031,SC2030,SC2162,SC2196,SC2034,SC2044,SC2119,SC1001,SC2188,SC2119,SC2188,SC2120,SC2103,SC2059,SC2006,SC2221,SC2222,SC2120,SC2128,SC2005,SC2004,SC2013,SC2027,SC2090,SC2089,SC2124,SC2001,SC2010,SC1072,SC1073,SC1009,SC2166,SC2045,SC2028,SC1091,SC1083 $(find . -name '*.sh'))
+result=$(shellcheck -e SC2016,SC2015,SC2086,SC2002,SC1117,SC2154,SC2076,SC2046,SC1090,SC2038,SC2031,SC2030,SC2162,SC2196,SC2034,SC2044,SC2119,SC1001,SC2188,SC2119,SC2188,SC2120,SC2103,SC2059,SC2006,SC2221,SC2222,SC2120,SC2128,SC2005,SC2013,SC2027,SC2090,SC2089,SC2124,SC2001,SC2010,SC1072,SC1073,SC1009,SC2166,SC2045,SC2028,SC1091,SC1083 $(find . -name '*.sh'))
 popd > /dev/null || exit
 
 if [[ $result ]]; then