bugfix for h2c buffers mem unmap (#718)

Author: itaibak

hdk/cl/examples/cl_sde/software/src/sde_lib/sde_mem.c

@@ -145,7 +145,7 @@ int sde_mem_close(struct sde_mem* mem) {
   }
 
   if (mem->h2c_buffers != NULL) {
-    for (size_t i = 0; i < mem->c2h_num_buffers; ++i) {
+    for (size_t i = 0; i < mem->h2c_num_buffers; ++i) {
       ret |= fpga_dma_mem_unmap(&mem->h2c_buffers[i].data_va, mem->h2c_buffers[i].alloc_length);
     }
   }
@@ -226,4 +226,4 @@ int sde_mem_get_buffers(struct sde_mem* mem, enum SDE_SUBSYSTEM subsystem, struc
 
 err:
   return ret;
-}
+}