COMP: fix compiler error from visual studio 2013

Errors detected when I try to compile OTBv4 with this new compiler. Other errors have been detected but corresponding corrections have been already done in the master.

Change-Id: I05791407fd6960928c17ca3229a5d7a909e9c21b
COMP: Logically dead code

CID 1080860 The indicated dead code may have performed some action;
that action will never occur.

In itk::​BMPImageIO::​CanWriteFile(char const*): Code can never be
reached because of a logical contradiction

Change-Id: Ib82a2b7f7e7c653f8df5337c1c10d1e91d7bc17f
COMP: Logically dead code

CID 1080861 The indicated dead code may have performed some action;
that action will never occur.

In itk::​GiplImageIO::​CanWriteFile(char const*): Code can never be
reached because of a logical contradiction

Change-Id: If717fcbdaa273bfd75f12126c05202c129eb462c
BUG: Fixed error handling in MINC IO

There was a mistake to print certain errors as debug messages.
They should be errors, indicating that either file is missing or corrupt, and
cannot be properly processed.

Change-Id: I031019818c267d7db357d9b67c26f69bd72ae093
Merge topic 'MINC2_EXCEPTION_FIX'

bd87cfb BUG: Fixed error handling in MINC IO
Merge topic 'Coverity_itkGiplImageIO'

fd538ac COMP: Logically dead code
Merge topic 'suport-vs2013'

ac124c3 COMP: fix compiler error from visual studio 2013
Merge topic 'Coverity_itkBMPImageIO'

ba7bf69 COMP: Logically dead code