During LTO build compiler reports some 'false positive' warnings about
variables being possibly used uninitialized.  This patch silences these
warnings.

Exemplary compiler warning to suppress (with LTO enabled):
error: 'link' may be used uninitialized in this function
[-Werror=maybe-uninitialized]
  if (link) {

Signed-off-by: Andrzej Ostruszka <aostruszka@marvell.com>

Approved by:	imp
Obtained from:	DPDK (46136031f19107f4e9b6b3a952cb7f57877a7f0f)
MFC after:	1 week