[source] ubus: update to the latest version

[LEDE Commits]

nbd pushed a commit to source.git, branch master:
https://git.lede-project.org/4b091ab01a8f73a639e52b74ac789fb7dd388840

commit 4b091ab01a8f73a639e52b74ac789fb7dd388840
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Mon Nov 13 10:43:34 2017 +0100

    ubus: update to the latest version
    
    9c13096 ubus: Remove unnecessary memset calls.
    6d1ea6c libubus: Fix deletion from context's object AVL tree when removing object
    e02813b ubusd: don't free messages in ubus_send_msg() anymore
    be146ad ubusd: rename goto label from `error` to `out`
    27d712d ubusd_monitor: alloc & free the buffer outside of the loop
    5f87f54 ubusd: move global retmsg per client
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
 package/system/ubus/Makefile | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/package/system/ubus/Makefile b/package/system/ubus/Makefile
index 1ac12cf..ce8b054 100644
--- a/package/system/ubus/Makefile
+++ b/package/system/ubus/Makefile
@@ -5,9 +5,9 @@ PKG_RELEASE:=1
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL=$(LEDE_GIT)/project/ubus.git
-PKG_SOURCE_DATE:=2017-11-06
-PKG_SOURCE_VERSION:=24ffe9b582b492054aebb59ac7a175fd65eef5d8
-PKG_MIRROR_HASH:=2663ace6f746c2687473799e2f863721e3fc7627c6c05da902d97680490c7ea7
+PKG_SOURCE_DATE:=2017-11-13
+PKG_SOURCE_VERSION:=5f87f5480ebf004d735dbf44259d08cf8affd305
+PKG_MIRROR_HASH:=a490348da86c6cdf0cbc8cc01b77fa6f708d86b94674fd312e0c822ca3d7eba0
 CMAKE_INSTALL:=1
 
 PKG_LICENSE:=LGPL-2.1