Ensure the test is skipped

/home/travis/build/OpenSCAP/openscap/tests/probes/rpm/rpminfo/test_probes_rpminfo.sh:
line 20: return: can only `return' from a function or sourced script

Author: jan-cerny

tests/probes/rpm/rpminfo/test_probes_rpminfo.sh

@@ -17,7 +17,7 @@
 
 set -e -o pipefail
 
-require "rpm" || return 255
+require "rpm" || exit 255
 A_NAME=`rpm --qf "%{NAME}\n" -qa | sort | uniq -u | sed -n '1p'`
 B_NAME=`rpm --qf "%{NAME}\n" -qa | sort | uniq -u | sed -n '2p'`