ktest: Store failure logs also in fatal paths

STORE_FAILURES was only saved from fail(), so paths that reached dodie()
could exit without preserving failure logs.

That includes fatal hook paths such as:

  POST_BUILD_DIE = 1

and ordinary failures when:

  DIE_ON_FAILURE = 1

Call save_logs("fail", ...) from dodie() too so fatal failures keep the
same STORE_FAILURES artifacts as non-fatal fail() paths.

Cc: John Hawley <warthog9@eaglescrag.net>
Link: https://patch.msgid.link/20260318-ktest-fixes-v1-1-9dd94d46d84c@suse.com
Signed-off-by: Ricardo B. Marlière <rbm@suse.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

Author: rbmarliere

tools/testing/ktest/ktest.pl

@@ -1635,6 +1635,11 @@ sub dodie {
 	print " See $opt{LOG_FILE} for more info.\n";
     }
 
+    # Fatal paths bypass fail(), so STORE_FAILURES needs to be handled here.
+    if (defined($store_failures)) {
+	save_logs("fail", $store_failures);
+    }
+
     if ($email_on_error) {
 	my $name = get_test_name;
 	my $log_file;