OffloadUtils - make processNetlinkResponse() static

Test: builds, atest
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I0357ce7edaf36929d0a221dd8e944f4c5830b53b
diff --git a/server/OffloadUtils.cpp b/server/OffloadUtils.cpp
index ae1d5d4..715d840 100644
--- a/server/OffloadUtils.cpp
+++ b/server/OffloadUtils.cpp
@@ -93,7 +93,7 @@
 }
 
 // TODO: merge with //system/netd/server/SockDiag.cpp:checkError(fd)
-int processNetlinkResponse(int fd) {
+static int processNetlinkResponse(int fd) {
     struct {
         nlmsghdr h;
         nlmsgerr e;