semonitor: properly initialize eof (#79)

In commit a78d311 ("Clean up message logic and eof handling")
the eof character was being checked in readData. When master mode
however, this led to an unbound eof variable as loop condiational.

Fixes #78

Signed-off-by: Olliver Schinagl <oliver@schinagl.nl>

semonitor.py

@@ -41,6 +41,7 @@ def terminate(code=0, msg=""):
 
 # process the input data
 def readData(args, mode, dataFile, recFile, outFile, keyStr):
+    eof = False
     updateBuf = list('\x00' * UPDATE_SIZE) if args.updatefile else []
     if mode.passiveMode:
         # skip data until the start of the first complete message