perf jit: Remove some no-op error handling

The 'info.e_machine' struct member is an uint16_t so 'm' is never less
than zero.  It looks like this was maybe left over code from earlier
versions so I've just removed it.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: kernel-janitors@vger.kernel.org
Link: http://lkml.kernel.org/r/20160715210836.GB19522@mwanda


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>