Fix flake8 variable warnings

Flake8 (somewhat correctly) was complaining that we had ambiguous
variable names (both named simply `l`).  This fixes the names to
be more descriptive.

Author: DirectXMan12

gssapi/raw/cython_converters.pyx

@@ -29,15 +29,15 @@ cdef gss_OID_set c_get_mech_oid_set(object mechs):
 cdef object c_create_oid_set(gss_OID_set mech_set, bint free=True):
     """Convert a GSS OID set struct to a set of OIDs"""
 
-    l = set()
+    py_set = set()
     cdef i
     for i in range(mech_set.count):
         mech_type = OID()
         mech_type._copy_from(mech_set.elements[i])
-        l.add(mech_type)
+        py_set.add(mech_type)
 
     cdef OM_uint32 tmp_min_stat
     if free:
         gss_release_oid_set(&tmp_min_stat, &mech_set)
 
-    return l
+    return py_set

gssapi/raw/types.pyx

@@ -144,15 +144,15 @@ class GenericFlagSet(collections.MutableSet):
 
     def __len__(self):
         # get the Hamming weight of _val
-        cdef unsigned int l = 0
+        cdef unsigned int size = 0
         cdef unsigned int i = 1
         while i < self.MAX_VAL:
             if i & self._val:
-                l += 1
+                size += 1
 
             i <<= 1
 
-        return l
+        return size
 
     def add(self, flag):
         self._val |= flag