Update onl_peek.m

fixed typo in accessing srate

Author: trmullen

code/online_analysis/onl_peek.m

@@ -80,4 +80,4 @@
 % update meta-data
 [chunk.nbchan,chunk.pnts,chunk.trials] = size(chunk.data);
 chunk.chanlocs = chunk.chanlocs(channels_to_get);
-chunk.xmax = chunk.xmin + (chunk.pnts-1)/buf.srate;
+chunk.xmax = chunk.xmin + (chunk.pnts-1)/chunk.srate;