hpt27xx(4): Stop checking for failures from malloc(M_WAITOK)
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D45852
(cherry picked from commit 28e413a699838df6fa5b0504c9ceb92a515037d9)
(cherry picked from commit 0341c77f203e5200470657a428f8ce63f2dc9988)