[gtk-doc] mkdb: fix 2 pep8 style warnings

[Stefan Sauer <stefkost src gnome org>]

commit 174ddc86f188e4696d6a282224b491d8f7b07fe3
Author: Stefan Sauer <ensonic users sf net>
Date:   Mon Jan 8 23:45:03 2018 +0100

    mkdb: fix 2 pep8 style warnings

 gtkdoc/mkdb.py |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gtkdoc/mkdb.py b/gtkdoc/mkdb.py
index c8cf095..6c394e5 100644
--- a/gtkdoc/mkdb.py
+++ b/gtkdoc/mkdb.py
@@ -454,7 +454,7 @@ def OutputDB(file, options):
 
         elif m3:
             filename = m3.group(1)
-            if not filename in file_def_line:
+            if filename not in file_def_line:
                 file_def_line[filename] = line_number
             else:
                 common.LogWarning(file, line_number, "Double <FILE>%s</FILE> entry. Previous occurrence on 
line %s." %
@@ -4100,7 +4100,7 @@ def OutputUnusedSymbols():
     UNUSED = common.open_text(new_unused_file, 'w')
 
     for symbol in sorted(iterkeys(Declarations)):
-        if not symbol in DeclarationOutput:
+        if symbol not in DeclarationOutput:
             UNUSED.write("%s\n" % symbol)
             num_unused += 1