OSHMEM: fixes 'improve mxm transport sanity check'

The code that actually checks for valid transport combos
somehow did not make it to the original commit:

74ab30b73855fdb4559ccdcdd4cae6545ac75236
OSHMEM: spml ikrit: remove empty lines in helpfile
Merge branch 'topic/oshmem_spml_ikrit_hw_rdma_channel-fix1'