Reduce irq handler indentation level.

The previous patch replaced an always-true test with "if (1)",
a function change.

This patch simply eliminates the "if (1)", and reduces the indentation
level of the entire [rather large] interrupt handler code.

No code changes other than eliminating the "if (1)" test.

Signed-off-by: Jeff Garzik <jgarzik@pobox.com>