debugobjects.h: fix trivial kernel doc warning

Add ':' to fix trivial kernel-doc warning in <linux/debugobjects.h>:

  ..//include/linux/debugobjects.h:63: warning: No description found for parameter 'is_static_object'

Link: http://lkml.kernel.org/r/575B01B8.5060600@infradead.org
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/debugobjects.h

@@ -38,7 +38,7 @@ struct debug_obj {
  * @name:		name of the object typee
  * @debug_hint:		function returning address, which have associated
  *			kernel symbol, to allow identify the object
- * @is_static_object	return true if the obj is static, otherwise return false
+ * @is_static_object:	return true if the obj is static, otherwise return false
  * @fixup_init:		fixup function, which is called when the init check
  *			fails. All fixup functions must return true if fixup
  *			was successful, otherwise return false