Fix shellcheck errors

build_kernel_deb.sh

@@ -47,7 +47,7 @@ usage() {
   echo "    -r Build the redpine reflash module."
 }
 
-while getopts ":hb:" opt; do
+while getopts ":hb:r" opt; do
   case ${opt} in
     b)
       pureos_board=$OPTARG
@@ -142,7 +142,7 @@ git log | head -n 1 | awk '{ print $2 };' >> "${OUTPUT_DIR}/kernel-git-${ARCH}.t
 
 case "${pureos_board}" in
     devkit)
-        if [ -ne ${build_redpine} ]; then
+        if [ ${build_redpine} -eq 1 ]; then
             build_redpine
         fi
     ;;