hdf5_der

[svn-r27695] HDFFV-0: Bug fix.
Problem: #if-#the-#else-#endif were added incorrectly to test_file_lock_concur()
such that the test would fail but did not execute a return statment. So, some
arbitary value is returned, causing confusion in the routine that called it.

Solution:
The #if-#the-#elif-... is unncessary. Fixed the #if-#endif so that they
are much shorter in scope and allowed the original return code to be
executed.

Tested: AIX ADA where it was discovered.