[PATCH] check-uapi: reject zero and malformed job counts

[omer zalman]

With -j 0, the per-header loop waits on an empty PID before any
worker starts. It counts that wait error as an ABI failure even when
the header passes. Reject non-positive or malformed job counts as
prerequisite errors before starting the check.

Signed-off-by: Omer Zalman <omerzalman42@xxxxxxxxx>

The exact git-format-patch file is attached because Gmail's web
composer removes tabs from inline diffs.

Attachment: 02-check-uapi-job-count.patch
Description: Binary data