hdf5_msb

[svn-r12279] Purpose:
Bug fix

Description:
When variables were declared in for loops C++ compiler on Cray X1 scoped
them oddly, leading to compilation errors.

Solution:
Moved variable declarations out of for loops (where they probably shouldn't
have been anyway) to the beginning of the function.

Platforms tested:
mir, Cray X1 (minor change)