[patch 07/31] IA64: fix NULL pointer in ia64/irq_chip-mask/unmask function

-stable review patch. If anyone has any objections, please let us know. -- From: KAMEZAWA Hiroyuki <[EMAIL PROTECTED]> [IA64] fix NULL pointer in ia64/irq_chip-mask/unmask function This patch fixes boot failure because irq_desc->mask() is NULL. - Added mask/unmask functions

[patch 07/31] IA64: fix NULL pointer in ia64/irq_chip-mask/unmask function

-stable review patch. If anyone has any objections, please let us know. -- From: KAMEZAWA Hiroyuki [EMAIL PROTECTED] [IA64] fix NULL pointer in ia64/irq_chip-mask/unmask function This patch fixes boot failure because irq_desc-mask() is NULL. - Added mask/unmask functions to