[sycl-bisect] Add missing exit (intel#6771)

This script has been missing one call to exit, which causes control to
fall through and run successful tests a second time when using --command
without --command-allow-bisect-codes. This didn't change the results of
the script, but it did make it slower if the test command takes a while
to run.

Author: dwoodwor-intel

devops/scripts/test-commit-sycl-bisect.bash

@@ -129,6 +129,7 @@ fi
 cd "$TEST_WD"
 if [[ "$COMMAND_ALLOW_BISECT_CODES" == "" ]]; then
   bash -c "$COMMAND" || exit 1
+  exit
 fi
 
 # Otherwise, just run the command.