qcacmn: Return error in hif start for allocation failures

This allocation failure will likely lead to a copy engine
stall and subsequent need to restart the subsystem.
Abort the module start immediately to avoid a system crash
or delayed subsystem restart.

Change-Id: Ibe7b348dee39d35e3e7f767f17f0114d888a30f8
CRs-Fixed: 1088725

hif/src/ce/ce_main.c

@@ -1740,11 +1740,16 @@ QDF_STATUS hif_start(struct hif_opaque_softc *hif_ctx)
 	if (hif_completion_thread_startup(hif_state))
 		return QDF_STATUS_E_FAILURE;
 
-	/* Post buffers once to start things off. */
-	(void)hif_post_recv_buffers(scn);
-
+	/* enable buffer cleanup */
 	hif_state->started = true;
 
+	/* Post buffers once to start things off. */
+	if (hif_post_recv_buffers(scn)) {
+		/* cleanup is done in hif_ce_disable */
+		HIF_ERROR("%s:failed to post buffers", __func__);
+		return QDF_STATUS_E_FAILURE;
+	}
+
 	return QDF_STATUS_SUCCESS;
 }