linux/irq.h: fix kernel-doc warning

Fix kernel-doc warning.  This struct member was removed in commit
875682648b89 ("irq: Remove irq_chip->release()") so remove its
associated kernel-doc entry also.

  Warning(include/linux/irq.h:338): Excess struct/union/enum/typedef member 'release' description in 'irq_chip'

Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Cc: Richard Weinberger <richard@nod.at>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/linux/irq.h b/include/linux/irq.h
index 61f5cec..a5261e3 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -301,8 +301,6 @@
  * @irq_pm_shutdown:	function called from core code on shutdown once per chip
  * @irq_print_chip:	optional to print special chip info in show_interrupts
  * @flags:		chip specific flags
- *
- * @release:		release function solely used by UML
  */
 struct irq_chip {
 	const char	*name;