Fix static analysis failures

src/freedombone-recoverkey

@@ -33,7 +33,7 @@ PROJECT_NAME='freedombone'
 export TEXTDOMAIN=${PROJECT_NAME}-recoverkey
 export TEXTDOMAINDIR="/usr/share/locale"
 
-source $PROJECT_INSTALL_DIR/${PROJECT_NAME}-vars
+source "$PROJECT_INSTALL_DIR/${PROJECT_NAME}-vars"
 
 # include utils which allow function_check, go and drive mount
 UTILS_FILES="/usr/share/${PROJECT_NAME}/utils/${PROJECT_NAME}-utils-*"