bladeRF: Fixed incorrectly placed 'else'

This addresses a defect introduced in 6e75abf which causes the
_consecutive_failures count to get reset with every failure, rather
then upon a successful return value.

lib/bladerf/bladerf_sink_c.cc

@@ -136,10 +136,10 @@ int bladerf_sink_c::work( int noutput_items,
         std::cerr << _pfx
                   << "Consecutive error limit hit. Shutting down."
                   << std::endl;
+    }
   } else {
     _consecutive_failures = 0;
   }
-  }
 
   return noutput_items;
 }