selftests/mm: ksft_exit functions do not return

After commit f7d5bcd35d42 ("selftests: kselftest: Mark functions that
unconditionally call exit() as __noreturn"), ksft_exit_...() functions
are marked as __noreturn, which means the return type should not be
'int' but 'void' because they are not returning anything (and never were
since exit() has always been called).

To facilitate updating the return type of these functions, remove
'return' before the calls to ksft_exit_...(), as __noreturn prevents the
compiler from warning that a caller of the ksft_exit functions does not
return a value because the program will terminate upon calling these
functions.

Reviewed-by: Muhammad Usama Anjum <[e-mail]>
Reviewed-by: Thomas Gleixner <[e-mail]>
Signed-off-by: Nathan Chancellor <[e-mail]>
Signed-off-by: Shuah Khan <[e-mail]>

tools/testing/selftests/mm/compaction_test.c

···
 	ksft_print_header();
 
 	if (prereq() || geteuid())
-		return ksft_exit_skip("Prerequisites unsatisfied\n");
+		ksft_exit_skip("Prerequisites unsatisfied\n");
 
 	ksft_set_plan(1);
 
···
 	}
 
 	if (check_compaction(mem_free, hugepage_size) == 0)
-		return ksft_exit_pass();
+		ksft_exit_pass();
 
-	return ksft_exit_fail();
+	ksft_exit_fail();
 }

tools/testing/selftests/mm/cow.c

···
 	if (err)
 		ksft_exit_fail_msg("%d out of %d tests failed\n",
 				   err, ksft_test_num());
-	return ksft_exit_pass();
+	ksft_exit_pass();
 }

tools/testing/selftests/mm/gup_longterm.c

···
 	if (err)
 		ksft_exit_fail_msg("%d out of %d tests failed\n",
 				   err, ksft_test_num());
-	return ksft_exit_pass();
+	ksft_exit_pass();
 }

tools/testing/selftests/mm/gup_test.c

···
 			break;
 		}
 		ksft_test_result_skip("Please run this test as root\n");
-		return ksft_exit_pass();
+		ksft_exit_pass();
 	}
 
 	p = mmap(NULL, size, PROT_READ | PROT_WRITE, flags, filed, 0);
···
 
 	free(tid);
 
-	return ksft_exit_pass();
+	ksft_exit_pass();
 }

tools/testing/selftests/mm/ksm_functional_tests.c

···
 	if (err)
 		ksft_exit_fail_msg("%d out of %d tests failed\n",
 				   err, ksft_test_num());
-	return ksft_exit_pass();
+	ksft_exit_pass();
 }

tools/testing/selftests/mm/madv_populate.c

···
 	if (err)
 		ksft_exit_fail_msg("%d out of %d tests failed\n",
 				   err, ksft_test_num());
-	return ksft_exit_pass();
+	ksft_exit_pass();
 }

tools/testing/selftests/mm/mkdirty.c

···
 	if (err)
 		ksft_exit_fail_msg("%d out of %d tests failed\n",
 				   err, ksft_test_num());
-	return ksft_exit_pass();
+	ksft_exit_pass();
 }

tools/testing/selftests/mm/pagemap_ioctl.c

···
 	ksft_print_header();
 
 	if (init_uffd())
-		return ksft_exit_pass();
+		ksft_exit_pass();
 
 	ksft_set_plan(115);
 
···
 	userfaultfd_tests();
 
 	close(pagemap_fd);
-	return ksft_exit_pass();
+	ksft_exit_pass();
 }

tools/testing/selftests/mm/soft-dirty.c

···
 
 	close(pagemap_fd);
 
-	return ksft_exit_pass();
+	ksft_exit_pass();
 }