Transceiver: Fixed copying of history into and from channelizer buffer.

In multi arfcn mode, osmo-trx would drop some bursts because it couldn't detect it
and would emit idle burst instead. Specificaly detection of peak in correlation
vector failed. Correcting copying of history in pullBuffer method fixes this issue.

[Re-worked by Pau Espin Pedrol <pespin@sysmocom.de>]

Fixes: 57df2362f0eca0a330aad3e18906046dfadb9c8b
Change-Id: I93e43f6868cd67e69fc59d2980a03550d2505bf8
diff --git a/Transceiver52M/radioInterfaceMulti.cpp b/Transceiver52M/radioInterfaceMulti.cpp
index 99f6231..eec426e 100644
--- a/Transceiver52M/radioInterfaceMulti.cpp
+++ b/Transceiver52M/radioInterfaceMulti.cpp
@@ -288,7 +288,7 @@
 		complex *dst = history[lchan]->begin();
 		float *fsrc = &buf[2 * (cLen - hLen)];
 		for (i = 0; i < hLen; i++) {
-			*dst = complex(fdst[0], fdst[1]);
+			*dst = complex(fsrc[0], fsrc[1]);
 			fsrc += 2;
 			dst++;
 		}