Editted pbuf.py to pass regression.

compiler/tests/04_pbuf_test.py

@@ -11,14 +11,14 @@ import globals
 from globals import OPTS
 import debug
 
-class pinvbuf_test(openram_test):
+class pbuf_test(openram_test):
 
     def runTest(self):
         globals.init_openram("config_20_{0}".format(OPTS.tech_name))
         global verify
         import verify
 
-        import pinv
+        import pbuf
 
         debug.info(2, "Testing inverter/buffer 4x 8x")
         a = pbuf.pbuf(8)