test(cancel,ls,man): remove redundant "return"

pytest.skip cancels the execution of the current test, so "return" and
subsequent codes arex unreachable.  We do not need to explicitly call
"return" in this context.

#1357 (comment)

Author: akinomyoga

test/t/test_cancel.py

@@ -16,7 +16,7 @@ def added_job(self, request, bash):
             )
         except AssertionError:
             pytest.skip("Could not add test print job")
-            return
+
         if len(got) > 3:
             request.addfinalizer(
                 lambda: assert_bash_exec(bash, "cancel %s" % got[3])

test/t/test_ls.py

@@ -33,7 +33,7 @@ def test_3(self, bash):
         part_full = find_unique_completion_pair(res)
         if not part_full:
             pytest.skip("No suitable test user found")
-            return
+
         part, full = part_full
         completion = assert_complete(bash, "ls ~%s" % part)
         assert completion == full[len(part) :]

test/t/test_man.py

@@ -23,7 +23,7 @@ def colonpath(self, request, bash):
             pass
         else:
             pytest.skip("Cygwin doesn't like paths with colons")
-            return
+
         tmpdir, _, _ = prepare_fixture_dir(
             request,
             files=["man/man3/Bash::Completion.3pm.gz"],