asapi_05: use safe format argument to tst_resm()

Prior to this pull request, the `asapi_05` test failed to build if `-Werror=format-security` was used. The compiler could not examine the contents of the `ftab` array.

Adjust the `tst_resm` call so that the format string is a string literal.

Fedora recently enabled this compiler option in their RPM builds, so this fixes the build on Fedora 21.