common: fix 'dummy' is used uninitialized in this function warning

fix this gcc 4.4 warning:

xyzModem.c: In function 'xyzModem_stream_open':
xyzModem.c:564: warning: 'dummy' is used uninitialized in this function

Signed-off-by: Kim Phillips <kim.phillips@freescale.com>

common/xyzModem.c

@@ -544,7 +544,7 @@ xyzModem_stream_open (connection_info_t * info, int *err)
 			  xyzModem_CHAR_TIMEOUT);
 #else
 /* TODO: CHECK ! */
-  int dummy;
+  int dummy = 0;
   xyz.__chan = &dummy;
 #endif
   xyz.len = 0;