btl/ofi: Fix valgrind complaints on uninitialized pointer use #6351
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It doesn't seem like the BTL was using uninitialized pointer. But simply
setting the rcache pointer to NULL after destroying it makes the valgrind
errors go away.
Fixes Issue #6345
Signed-off-by: Aravind Gopalakrishnan Aravind.Gopalakrishnan@intel.com