Fix xhci_build flags handling

Switch to using [[ bash operator for robustness
In case of multiple LTS build versions for the same major.minor.0-patch version then use the last one.
Fix minor cosmetic inconsistency
The v4.18 bug fix was retrofitted with 4.4.0-170. Assume that this may occur for other kernel branches as well

scripts/patch-realsense-ubuntu-lts.sh

@@ -40,7 +40,7 @@ LINUX_BRANCH=$(uname -r)
 #Get kernel major.minor
 IFS='.' read -a kernel_version <<< ${LINUX_BRANCH}
 k_maj_min=$((${kernel_version[0]}*100 + ${kernel_version[1]}))
-if [ ${k_maj_min} -ne 404 ]; then
+if [[ ( ${xhci_patch} -eq 1 ) && ( ${k_maj_min} -ne 404 ) ]]; then
 	echo -e "\e[43mThe xhci_patch flag is compatible with LTS branch 4.4 only, currently selected kernel is $(uname -r)\e[0m"
 	exit 1
 fi
@@ -83,8 +83,8 @@ cd ${kernel_name}
 #then
 #Search the repository for the tag that matches the mmaj.min.patch-build of Ubuntu kernel
 kernel_full_num=$(echo $LINUX_BRANCH | cut -d '-' -f 1,2)
-kernel_git_tag=$(git ls-remote --tags origin | grep ${kernel_full_num} | grep '[^^{}]$' | awk -F/ '{print $NF}')
-echo -e "\e[32mDownload Ubuntu LTS tag \e[47m${kernel_git_tag}\e[32m \e[0m"
+kernel_git_tag=$(git ls-remote --tags origin | grep ${kernel_full_num} | grep '[^^{}]$' | tail -n 1 | awk -F/ '{print $NF}')
+echo -e "\e[32mFetching Ubuntu LTS tag \e[47m${kernel_git_tag}\e[0m \e[32m to the local kernel sources folder\e[0m"
 git fetch origin tag ${kernel_git_tag} --no-tags
 
 # Verify that there are no trailing changes., warn the user to make corrective action if needed
@@ -108,7 +108,7 @@ then
 	fi
 fi
 
-echo -e "\e[Switching to LTS tag ${kernel_git_tag}\e[0m"
+echo -e "\e[32mSwitching to LTS tag ${kernel_git_tag}\e[0m"
 git checkout ${kernel_git_tag}
 
 
@@ -130,7 +130,7 @@ else
 	# See reference https://patchwork.kernel.org/patch/9907707/
 	if [ ${k_maj_min} -lt 418 ]; then
 		echo -e "\e[32mRetrofit uvc bug fix enabled with 4.18+\e[0m"
-		patch -p1 < ../scripts/v1-media-uvcvideo-mark-buffer-error-where-overflow.patch
+		patch -R -p1 < ../scripts/v1-media-uvcvideo-mark-buffer-error-where-overflow.patch
 	fi
 	if [ $xhci_patch -eq 1 ]; then
 		echo -e "\e[32mApplying streamoff hotfix patch in videobuf2-core\e[0m"
@@ -222,12 +222,15 @@ echo -e "\e[32mPatched kernels modules were created successfully\n\e[0m"
 # Load the newly-built modules
 # As a precausion start with unloading the core uvcvideo:
 try_unload_module uvcvideo
+try_unload_module videodev
+
+echo $build_usbcore_modules
+if [ $build_usbcore_modules -eq 1 ]; then
 try_unload_module videobuf2_v4l2
 try_unload_module videobuf2_core
 try_unload_module v4l2_common
-try_unload_module videodev
 
-if [ $build_usbcore_modules -eq 1 ]; then
+
 	#Replace usb subsystem modules
 	try_unload_module usbhid
 	try_unload_module xhci-pci