fix #warning about using kernel headers in userpsace

Move the preprocessor #warning message:
warning: #warning Attempt to use kernel headers from user space,
see http://kernelnewbies.org/KernelHeaders
from kernel.h to types.h.

And also fixe the #warning message due to the preprocessor not being able to
read the web address due to it thinking it was the start of a comment.  also
remove the extra #ifndef _KERNEL_ since it's already there.
Signed-off-by: Justin P. Mattock <justinmattock@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

include/linux/kernel.h

@@ -728,12 +728,6 @@ extern int do_sysinfo(struct sysinfo *info);
 
 #endif /* __KERNEL__ */
 
-#ifndef __EXPORTED_HEADERS__
-#ifndef __KERNEL__
-#warning Attempt to use kernel headers from user space, see http://kernelnewbies.org/KernelHeaders
-#endif /* __KERNEL__ */
-#endif /* __EXPORTED_HEADERS__ */
-
 #define SI_LOAD_SHIFT	16
 struct sysinfo {
 	long uptime;			/* Seconds since boot */

include/linux/types.h

@@ -8,7 +8,10 @@
 
 #define DECLARE_BITMAP(name,bits) \
 	unsigned long name[BITS_TO_LONGS(bits)]
-
+#else
+#ifndef __EXPORTED_HEADERS__
+#warning "Attempt to use kernel headers from user space, see http://kernelnewbies.org/KernelHeaders"
+#endif /* __EXPORTED_HEADERS__ */
 #endif
 
 #include <linux/posix_types.h>