staging: vchiq_arm: print real dump limit

We better use the real loop limit in the warning about
"too many active services". Another benefit is than we don't have to care
about the format string in the following change.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>