coll/base: fix memory free in ompi_coll_base_allreduce_intra_recursivedoubling err handler

Fix CID 1362630

Fixes open-mpi/ompi@0e393195d9

ompi/mca/coll/base/coll_base_allreduce.c

@@ -271,7 +271,7 @@ ompi_coll_base_allreduce_intra_recursivedoubling(const void *sbuf, void *rbuf,
     OPAL_OUTPUT((ompi_coll_base_framework.framework_output, "%s:%4d\tRank %d Error occurred %d\n",
                  __FILE__, line, rank, ret));
     (void)line;  // silence compiler warning
-    if (NULL != inplacebuf) free(inplacebuf);
+    if (NULL != inplacebuf_free) free(inplacebuf_free);
     return ret;
 }