ubwcp: incorrect return of ubwcp buf when dmabuf match is not found

When dmabuf does not exists in our record, we were matching it
to the last ubwcp buf instead of returning NULL. Also fixed
incorrect state check for hw ver call.

Change-Id: If899bab884a049dcbb8a9acd45a706d10e6d77d4
Signed-off-by: Amol Jadi <quic_ajadi@quicinc.com>

ubwcp/ubwcp_main.c

@@ -353,6 +353,7 @@ static int ubwcp_power(struct ubwcp_driver *ubwcp, bool enable)
 static struct ubwcp_buf *dma_buf_to_ubwcp_buf(struct dma_buf *dmabuf)
 {
 	struct ubwcp_buf *buf = NULL;
+	struct ubwcp_buf *ret_buf = NULL;
 	struct ubwcp_driver *ubwcp = ubwcp_get_driver();
 	unsigned long flags;
 
@@ -362,12 +363,14 @@ static struct ubwcp_buf *dma_buf_to_ubwcp_buf(struct dma_buf *dmabuf)
 	spin_lock_irqsave(&ubwcp->buf_table_lock, flags);
 	/* look up ubwcp_buf corresponding to this dma_buf */
 	hash_for_each_possible(ubwcp->buf_table, buf, hnode, (u64)dmabuf) {
-		if (buf->dma_buf == dmabuf)
+		if (buf->dma_buf == dmabuf) {
+			ret_buf = buf;
 			break;
+		}
 	}
 	spin_unlock_irqrestore(&ubwcp->buf_table_lock, flags);
 
-	return buf;
+	return ret_buf;
 }
 
 
@@ -387,7 +390,7 @@ int ubwcp_get_hw_version(struct ubwcp_ioctl_hw_version *ver)
 	if (!ubwcp)
 		return -1;
 
-	if (ubwcp->state != UBWCP_STATE_FAULT)
+	if (ubwcp->state == UBWCP_STATE_INVALID)
 		return -EPERM;
 
 	ver->major = ubwcp->hw_ver_major;