procd: update to latest git HEAD

31f0765 procd: check strchr() result before using it

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
(cherry picked from commit 9a72e7f601)

package/system/procd/Makefile

@@ -13,8 +13,8 @@ PKG_RELEASE:=1
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL=$(PROJECT_GIT)/project/procd.git
 PKG_SOURCE_DATE:=2019-05-30
-PKG_SOURCE_VERSION:=ade00ca585a49c8478bf60eb24ce385676be37a4
-PKG_MIRROR_HASH:=1417727ae6fcda01017e1bec3ec66e3e78116f9343cfe0256e40af54c52f2acc
+PKG_SOURCE_VERSION:=31f0765afd61f55b1dd2cdb62ec1968efca19690
+PKG_MIRROR_HASH:=cee6eb96abc2c7f806f6eea463bab0ab969db1a5eda44c614c75ed90eb188b35
 CMAKE_INSTALL:=1
 
 PKG_LICENSE:=GPL-2.0