Fix for HDFFV-7838 h5ls: segfault for handling region reference in attribute with -v option
Description:
Segfault occurred when h5ls access region reference data in an attribute.
This didn't occurred when -v option was used.
The cause was "h5tool_format_t info;" struct variable members were accessed
without proper values were assigned (was NULL), so printf failed later in the code.
Tested:
jam (linux32-LE), koala (linux64-LE), heiwa (linuxppc64-BE), tejeda (mac32-LE), linew (solaris-BE), cmake-Windows (32-LE)
