qcacmn: Delete unnecessary print "failed to post to sch queue"

Delete print "failed to post to QDF_MODULE_ID_SCAN" as it doesn't
gives any useful info. How many times failure has happened can be
read from __sched_dup_fail_count.

Change-Id: Id4ec411d5a32f09c971330e860b50d1a91e7c70b
CRs-Fixed: 2326611

umac/scan/dispatcher/src/wlan_scan_tgt_api.c

@@ -321,7 +321,6 @@ QDF_STATUS tgt_scan_bcn_probe_rx_callback(struct wlan_objmgr_psoc *psoc,
 		return status;
 
 	wlan_objmgr_psoc_release_ref(psoc, WLAN_SCAN_ID);
-	scm_err("failed to post to QDF_MODULE_ID_SCAN");
 
 free:
 	if (bcn && bcn->rx_data)