kernel-install: ignore errors when reading /etc/machine-id

If /etc/machine-id doesn't end with a newline (which is wrong, but it
can happen), kernel-install fails. That's because `read` returns 1 if it
reaches EOF and we're using `set -e`. Let's just ignore that error, as
it doesn't matter: we have either read a valid machine ID, in which case
we continue, or we haven't, in which case we exit anyway.

RHEL-only: feature

Resolves: RHEL-50672

src/kernel-install/kernel-install.in

@@ -159,7 +159,7 @@ if [ -z "$MACHINE_ID" ] && [ -f /etc/machine-info ]; then
         log_verbose "machine-id $MACHINE_ID acquired from /etc/machine-info"
 fi
 if [ -z "$MACHINE_ID" ] && [ -s /etc/machine-id ]; then
-    read -r MACHINE_ID </etc/machine-id
+    read -r MACHINE_ID </etc/machine-id || :
     if [ "$MACHINE_ID" = "uninitialized" ]; then
         unset MACHINE_ID
     elif [ {{ '${#MACHINE_ID}' }} -ne 32 ]; then