[alsa] fix missing - in -EPIPE

git-svn-id: svn+ssh://jackaudio.org/trunk/jack@4126 0c269be4-1314-0410-8aa9-9f06e86f4224

drivers/alsa/alsa_driver.c

@@ -1698,7 +1698,7 @@ alsa_driver_write (alsa_driver_t* driver, jack_nframes_t nframes)
 				offset, contiguous)) < 0) {
 			jack_error ("ALSA: could not complete playback of %"
 				PRIu32 " frames: error = %d", contiguous, err);
-			if (err != EPIPE && err != ESTRPIPE)
+			if (err != -EPIPE && err != -ESTRPIPE)
 				return -1;
 		}