libprocessgroup: Remove unused uid_path from RemoveProcessGroup

This variable is no longer used.

Fixes: d0464b0c01 ("libprocessgroup: Do not remove uid cgroups directory")
Change-Id: I2b606d953722cf38cc865d91ea00a3b08236675b
diff --git a/libprocessgroup/processgroup.cpp b/libprocessgroup/processgroup.cpp
index a021594..e294260 100644
--- a/libprocessgroup/processgroup.cpp
+++ b/libprocessgroup/processgroup.cpp
@@ -216,7 +216,6 @@
 static int RemoveProcessGroup(const char* cgroup, uid_t uid, int pid, unsigned int retries) {
     int ret = 0;
     auto uid_pid_path = ConvertUidPidToPath(cgroup, uid, pid);
-    auto uid_path = ConvertUidToPath(cgroup, uid);
 
     while (retries--) {
         ret = rmdir(uid_pid_path.c_str());