MFC	r278790, r278802: Initialize the allocation of variables related to the ext2 allocator.
MFC	r278790, r278802:
Initialize the allocation of variables related to the ext2 allocator.

Use malloc to clear the values and initialize e2fs_contigdirs
during allocation.  free() e2fs_contigdirs upon error.

While here clean up small style issues.

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase