wctc4xxp: Trivial reduction of indentation level in wctc4xxp_watchdog()

Now use a continue after the check for cmd->timeout. This change is because I
need to make another change but the deep indentation level would make it hard to
stay within the 80 column limit.

Signed-off-by: Shaun Ruffell <sruffell@digium.com>
Signed-off-by: Russ Meyerriecks <rmeyerriecks@digium.com>
wctc4xxp: spin_lock() -> spin_lock_irqsave() in wctc4xxp_watchdog()

Since commit (e10f740 "wctc4xxp: Service tx ring in interrupt handler."), it
was possible to deadlock the system if the interrupt fires while the
watchdog function is running in the context of the system timer.

This was reported by lockdep.

Signed-off-by: Shaun Ruffell <sruffell@digium.com>
Signed-off-by: Russ Meyerriecks <rmeyerriecks@digium.com>