[PATCH] Bluetooth: mesh: Correct segmentation logic

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The decision whether to segment or not didn't consider the size of the MIC

diff --git a/mesh/net.c b/mesh/net.c
index 2d75c4f7d..96e82fe1c 100644
--- a/mesh/net.c
+++ b/mesh/net.c
@@ -2098,7 +2098,7 @@ bool net_access_layer_send(uint8_t ttl, uint16_t src, uint32_t dst,
 	if (!result)
 		return false;
 
-	segN = SEG_MAX(len);
+	segN = SEG_MAX(len + sizeof(uint32_t));
 
 	/* Only one ACK required SAR message per destination at a time */
 	if (segN && IS_UNICAST(dst)) {
--
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