devctl.h: Fix typo and include proper header

Remove stray commas.  Include <sys/cdefs.h> for __restrict (includes
<stddef.h> indirectly).

Signed-off-by: Sebastian Huber <sebastian.huber@embedded-brains.de>

newlib/libc/include/devctl.h

@@ -37,14 +37,14 @@
  */
 
 #ifdef _POSIX_26_C_SOURCE
-#include <stddef.h>
+#include <sys/cdefs.h>
 
 int posix_devctl(
-  int               fd,
-  int               dcmd,
-  void *__restrict, dev_data_ptr,
-  size_t            nbyte,
-  int *__restrict,  dev_info_ptr
+  int              fd,
+  int              dcmd,
+  void *__restrict dev_data_ptr,
+  size_t           nbyte,
+  int *__restrict  dev_info_ptr
 );
 #endif