util: Fix unloading of suite lib import path

Change-Id: Iac81151f5baec092a3d15bbe6541b5bc007e6a03
diff --git a/src/osmo_gsm_tester/util.py b/src/osmo_gsm_tester/util.py
index c7efb77..27c71cf 100644
--- a/src/osmo_gsm_tester/util.py
+++ b/src/osmo_gsm_tester/util.py
@@ -119,7 +119,7 @@
 
 def import_path_remove(pathname):
     dir = os.path.realpath(pathname)
-    if dir not in sys.path:
+    if dir in sys.path:
         sys.path.remove(dir)
 
 class listdict(dict):