LU-3405 build: fix 'control flow' errors

LU-3405 build: fix 'control flow' errors

Fix 'control flow' issues found by Coverity version 6.5.1:
Logically dead code (DEADCODE)
Execution cannot reach this statement.
Missing break in switch (MISSING_BREAK)
This case is not terminated by a 'break' statement.
Stray semicolon (STRAY_SEMICOLON)
"if" statement with no "then" or "else" is suspicious.
Unsigned compared against 0 (NO_EFFECT)
This greater-than-or-equal-to-zero comparison of an unsigned value
is always true.

Signed-off-by: Sebastien Buisson <sebastien.buisson@bull.net>
Change-Id: Ia737603bd9ef4dd6b01891b9b13edd59dec11891
Reviewed-on: http://review.whamcloud.com/6466
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>