mock: typofix s/but but/but/ in buildroot.py

Closes: #1527

Author: cheese1

mock/py/mockbuild/buildroot.py

@@ -943,8 +943,8 @@ def _setup_nosync(self):
             return
 
         multilib = ('x86_64', 's390x')
-        # ld_preload need to be same as in bootstrap because we call DNF in bootstrap, but
-        # but it will load nosync from the final chroot
+        # ld_preload need to be same as in bootstrap because we call DNF in
+        # bootstrap, but it will load nosync from the final chroot
         if self.bootstrap_buildroot is not None:
             self.tmpdir = self.bootstrap_buildroot.tmpdir
             if not os.path.isdir(self.tmpdir):