Add decode() to ascii string in offcputime.py

Fixes: #318
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

tools/offcputime.py

@@ -186,7 +186,7 @@ while (1):
     for k, v in sorted(counts.items(), key=lambda counts: counts[1].value):
         if folded:
             # print folded stack output
-            line = k.name + ";"
+            line = k.name.decode() + ";"
             for i in reversed(range(0, maxdepth)):
                 if k.ret[i] == 0:
                     continue