UAPI: Guard linux/cuda.h

Place reinclusion guards on linux/cuda.h otherwise the UAPI splitter script
won't insert a #include to make the kernel header include the UAPI header.
 
Signed-off-by: David Howells <dhowells@redhat.com>

include/linux/cuda.h

@@ -5,6 +5,9 @@
  * Copyright (C) 1996 Paul Mackerras.
  */
 
+#ifndef _LINUX_CUDA_H
+#define _LINUX_CUDA_H
+
 /* CUDA commands (2nd byte) */
 #define CUDA_WARM_START		0
 #define CUDA_AUTOPOLL		1
@@ -34,3 +37,5 @@ extern int cuda_request(struct adb_request *req,
 extern void cuda_poll(void);
 
 #endif	/* __KERNEL */
+
+#endif /* _LINUX_CUDA_H */