releasetools: fix cleaning up /tmp/

* previous commit did exactly nothing...

Change-Id: I66876aff83528596d628d24e60b5d4c0d81577bd

Author: invisiblek

tools/releasetools/common.py

@@ -434,7 +434,7 @@ def UnzipTemp(filename, pattern=None):
   OPTIONS.tempfiles.append(tmp)
 
   def unzip_to_dir(filename, dirname):
-    cmd = ["rm", "-rf", dirname + filename, "targetfiles-*"]
+    subprocess.call(["rm", "-rf", dirname + filename, "targetfiles-*"])
     cmd = ["unzip", "-o", "-q", filename, "-d", dirname]
     if pattern is not None:
       cmd.append(pattern)