lxc-download: Ignore return code from subshell

The previous change fixed parsing of multiple uid/gid ranges by using a
while loop, however a failure in that loop will cause the script to exit
(due to -e), so we need to ignore the return value of the commands
inside that loop.

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>

templates/lxc-download.in

@@ -143,8 +143,8 @@ gpg_validate() {
 in_userns() {
     [ -e /proc/self/uid_map ] || { echo no; return; }
     awk '{ print $1 " " $2 " " $3 }' /proc/self/uid_map | while read line; do
-        [ "$line" = "0 0 4294967295" ] && { echo no; return; }
-        echo $line | grep -q " 0 1$" && { echo userns-root; return; }
+        [ "$line" = "0 0 4294967295" ] && { echo no; return; } || true
+        echo $line | grep -q " 0 1$" && { echo userns-root; return; } || true
     done
 
     [ "$(cat /proc/self/uid_map)" = "$(cat /proc/1/uid_map)" ] && \