netsnmp_large_fd_set_resize

In profiling the net-snmp code it was discovered that the function
netsnmp_large_fd_set_resize is consuming a lot of cpu time.

Does anyone know the ramifications of not doing the following set of
code:
 	/*
	 * Unix: clear the file descriptors defined in the resized
*fdset
	 * but that were not defined in the original *fdset.
	 */
	for (i = fdset->lfs_setsize + 1; i < setsize; i++)
	    FD_CLR(i, fdset->lfs_setptr);


69.39 %  netsnmp_large_fd_set_resize

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