Small fixes,

Fix: removed a call to free,  which I think made linux people unhappy during "lf t55xx rd 0"...
Add: "lf t55xx fsk"  now kind of outputs binary from "FSK2a R/40 R/50"..

client/cmdlft55xx.h

@@ -18,6 +18,7 @@ int CmdWriteBlk(const char *Cmd);
 int CmdWriteBLkPWD(const char *Cmd);
 int CmdReadTrace(const char *Cmd);
 int CmdInfo(const char *Cmd);
+int CmdIceFsk(const char *Cmd);
 char * GetBitRateStr(uint32_t id);
 char * GetSaferStr(uint32_t id);
 char * GetModulationStr( uint32_t id);