weed_inhib(): correct the condition to re-suspend a thread
suspended for SINGLE_ALLPROC mode. There is no need to check for
boundary state. It is only required to see that the suspension comes
from the ALLPROC mode.
In collaboration with: pho
Reviewed by: markj
Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks
Differential revision: https://reviews.freebsd.org/D35310