libmemif: added tests

This patch provides unit tests for libmemif written in Unity

Type: test

Signed-off-by: Daniel Béreš <dberes@cisco.com>
Signed-off-by: Mohsin Kazmi <sykazmi@cisco.com>
Change-Id: I19116def6e6d28efd5f460c93911245474a11321
diff --git a/extras/libmemif/src/main.c b/extras/libmemif/src/main.c
index e735ee3..e87d4c5 100644
--- a/extras/libmemif/src/main.c
+++ b/extras/libmemif/src/main.c
@@ -412,11 +412,12 @@
   if (ms->timer_fd >= 0)
     {
       uint64_t u64;
+      ssize_t __attribute__ ((unused)) r;
       /*
 	Have to read the timer fd else it stays read-ready
 	and makes epoll_pwait() return without sleeping
       */
-      read (ms->timer_fd, &u64, sizeof (u64));
+      r = read (ms->timer_fd, &u64, sizeof (u64));
     }
 
   /* loop ms->slave_interfaces and request connection for disconnected ones */