Delete MString in omlc_inject_metadata after we *really* don't need its content
Delete MString in omlc_inject_metadata after we *really* don't need its content

Also, remove a mighty misleading comment. omlc_set_string does not
allocate storage. I repeat: omlc_set_string DOES NOT
allocate storage.

fixes: #1408

Signed-off-by: Olivier Mehani <9858fe98d2c7f5f35e0d2a08f134cfc58afd42d3@nicta.com.au>

mytestbed/oml,mytestbed/oml,alco90/soml,alco90/soml,mytestbed/oml,mytestbed/oml,lees0414/EUproject,lees0414/EUproject,lees0414/EUproject,alco90/soml,alco90/soml,lees0414/EUproject,alco90/soml,lees0414/EUproject,mytestbed/oml