Let's free the allocated rec_argv in case we return early, in order to
avoid leaking memory.

This adds free() at a few very similar places across the tree where it
was missing.
Signed-off-by: NMartin Kepplinger <martink@posteo.de>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Martin kepplinger <martink@posteo.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20170913191419.29806-1-martink@posteo.deSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>