Check for number of arguments instead of a NULL argument.
Thanks to Masamichi Takagi @ NEC, Japan for reporting the error and suggesting the patch. The cached PUTs array was not reinitialized to NULL values after the first time they were sent upstream and cleared. So the next time we push them upstream, they contained garbage data causing segfaults. This patch looks for the number of arguments rather than a NULL argument as a termination detector. Signed-off-by: Masamichi Takagi <firstname.lastname@example.org>