rtems_version_control_key() may return NULL

[Sebastian Huber]

Hello,

the

const char *rtems_version_control_key( void )
{
#ifdef RTEMS_VERSION_VC_KEY
   return RTEMS_VERSION_VC_KEY;
#else
   return NULL;
#endif
}

returns NULL, if no RTEMS_VERSION_VC_KEY is defined, e.g. the RTEMS 
sources are not managed by Git. Naive users like me may produce a NULL 
pointer if they use it like this printf("version: %s", 
rtems_version_control_key()). Should we change this function to return 
"" instead of NULL?

-- 
Sebastian Huber, embedded brains GmbH

Address : Dornierstr. 4, D-82178 Puchheim, Germany
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