selftests/filesystems: devpts_pts included wrong header

We were picking up the wrong header should use asm/ioctls.h form the kernel
and not the header from the system (sys/ioctl.h). In the current code we
added the correct include and we added the kernel headers path to the CFLAGS.

Fixes: ce290a19 ("selftests: add devpts selftests")
Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Shuah Khan (Samsung OSG) <shuah@kernel.org>

tools/testing/selftests/filesystems/Makefile

 # SPDX-License-Identifier: GPL-2.0
 
+CFLAGS += -I../../../../usr/include/
 TEST_GEN_PROGS := devpts_pts
 TEST_GEN_PROGS_EXTENDED := dnotify_test
 

tools/testing/selftests/filesystems/devpts_pts.c

@@ -8,7 +8,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
-#include <sys/ioctl.h>
+#include <asm/ioctls.h>
 #include <sys/mount.h>
 #include <sys/wait.h>