cleanup: remove trailing spaces in prepare.sh

Signed-off-by: Niels de Vos <ndevos@redhat.com>

prepare.sh

@@ -1,5 +1,7 @@
 #!/bin/bash
 
+set -e -o pipefail
+
 # In case no value is specified, default values will be used.
 gitrepo="https://github.com/ceph/ceph-csi"
 workdir="tip/"
@@ -25,7 +27,7 @@ then
     exit 1
 fi
 
-eval set -- ${opts}
+eval set -- "${opts}"
 
 while true; do
     case "${1}" in
@@ -52,7 +54,7 @@ while true; do
     --ref)
         shift
         ref=${1}
-        echo ${ref}      
+        echo "${ref}"
         ;;
     --)
         shift
@@ -66,7 +68,7 @@ set -x
 
 yum -y install git podman
 
-git clone --depth=1 ${gitrepo} ${workdir}
-cd ${workdir}
+git clone --depth=1 "${gitrepo}" "${workdir}"
+cd "${workdir}"
 git fetch --depth=1 origin "${ref}:tip/${ref}"
 git checkout "tip/${ref}"