asapi_05: use safe format argument to tst_resm()

Prior to this commit, 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.

Signed-off-by: Ken Dreyer <kdreyer@redhat.com>
Merge pull request #24 from ktdreyer/asapi_05-format-string

asapi_05: use safe format argument to tst_resm()