Fix 'push --all branch...' error handling
Fix 'push --all branch...' error handling

The builtin-fetch topic changed push's handling of --all to setting
the new TRANSPORT_PUSH_ALL flag before starting the push subroutine
for the given transport.  Unfortunately not all references within
builtin-push were changed to test this flag therefore allowing push
to incorrectly accept refspecs and --all.

Signed-off-by: Shawn O. Pearce <f01032651c12a22b2103346ba96b3b6b231f9d3c@spearce.org>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git