Update build

kernel/build

@@ -16,7 +16,7 @@ case $KTREE in
 	mainline)
 		PATCHSUFFIX="patch"
 		# check if kernel has been downloaded this week, if not download/update it
-		if [ "$(date +'%V%y')" != "$(cat kern-dl-date-$ARCH 2>/dev/null)" -o $(cat ktree) != "mainline" ]; then
+		if [[ "$(date +'%V%y')" != "$(cat kern-dl-date-$ARCH 2>/dev/null)" || $(cat ktree) != "mainline" ]]; then
 			echo "Downloading kernel for $ARCH"
 			curl -L "$(curl -sL https://www.kernel.org/ | grep "Download complete tarball" | head -n1 | tr '"' ' ' | awk '{print $3}')" -o Linux-archive
 			rm -rf linux-$ARCH