[Bug 238183] cam/scsi/scsi_sa.c: warnings issued by static analysis

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238183

            Bug ID: 238183
           Summary: cam/scsi/scsi_sa.c: warnings issued by static analysis
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: danfe at FreeBSD.org

PVS Studio produces lots of warnings over /usr/src/sys/cam/scsi/scsi_sa.c, but
most of them are too noisy and out of scope right now.  Three of them, however,
look more sensible and probably worth taking a closer look:

cam/scsi/scsi_sa.c:3216:1: warning: V547 Expression 'softc->last_media_blksize
== 0' is always false.

cam/scsi/scsi_sa.c:3550:1: warning: V560 A part of conditional expression is
always false: (stream_valid == 0).

cam/scsi/scsi_sa.c:4416:1: warning: V519 The 'error' variable is assigned
values twice successively. Perhaps this is a mistake. Check lines: 4414, 4416.

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