Fix new E721 flake8 warning

pycheribuild/mtree.py

@@ -265,7 +265,7 @@ def exclude_matching(self, globs, exceptions=None, print_status=False) -> None:
         """Remove paths matching any pattern in globs (but not matching any in exceptions)"""
         if exceptions is None:
             exceptions = []
-        if type(globs) == str:
+        if isinstance(globs, str):
             globs = [globs]
         for glob in globs + exceptions:
             # glob must be anchored at the root (./) or start with a pattern

pycheribuild/projects/cross/cheribsd.py

@@ -127,7 +127,7 @@ def __init__(self, kernconf: str, platforms: "set[ConfigPlatform]", kernel_abi=K
         self.fett = fett
 
     def __repr__(self) -> str:
-        flags = [key for key, val in self.__dict__.items() if type(val) == bool and val]
+        flags = [key for key, val in self.__dict__.items() if isinstance(val, bool) and val]
         return "CheriBSDConfig({kernconf} {platform}:{kernel_abi} [{flags}])".format(
             kernconf=self.kernconf, platform=self.platforms, kernel_abi=self.kernel_abi.value, flags=" ".join(flags))