qcacmn: Address compilation issue

The function "ucfg_dfs_is_hw_pulses_allowed" should return bool and has
a compilation error
"return' with no value, in function returning non-void".

Return the bool type "false" when the dfs is a NULL object.

CRs-Fixed: 2715235
Change-Id: I8717aaedd1ac8208ce6257721d5890b82ca13a8f

umac/dfs/dispatcher/src/wlan_dfs_ucfg_api.c

@@ -394,7 +394,7 @@ bool ucfg_dfs_is_hw_pulses_allowed(struct wlan_objmgr_pdev *pdev)
 	dfs = wlan_pdev_get_dfs_obj(pdev);
 	if (!dfs) {
 		dfs_err(dfs, WLAN_DEBUG_DFS_ALWAYS, "dfs is NULL");
-		return;
+		return false;
 	}
 
 	return dfs_is_hw_pulses_allowed(dfs);