selftests/kcmp: remove unused open mode

Android bionic warns that open modes are ignored if O_CREAT or O_TMPFILE
aren't specified.  The permissions for the file are set above:

	fd1 = open(kpath, O_RDWR | O_CREAT | O_TRUNC, 0644);

Link: https://lkml.kernel.org/r/[email protected]
Fixes: d97b46a ("syscalls, x86: add __NR_kcmp syscall")
Signed-off-by: Edward Liaw <[email protected]>
Reviewed-by: Cyrill Gorcunov <[email protected]>
Cc: Eric Biederman <[email protected]>
Cc: Shuah Khan <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: edliaw

tools/testing/selftests/kcmp/kcmp_test.c

@@ -91,7 +91,7 @@ int main(int argc, char **argv)
 		ksft_print_header();
 		ksft_set_plan(3);
 
-		fd2 = open(kpath, O_RDWR, 0644);
+		fd2 = open(kpath, O_RDWR);
 		if (fd2 < 0) {
 			perror("Can't open file");
 			ksft_exit_fail();