Fix two bugs found by the regression test suites. The bug was created when

Fix two bugs found by the regression test suites.  The bug was created when
we changed ext2fs_create_resize_inode to always create the resize inode,
even when s_reserved_gdt_blocks is zero.  Mke2fs and e2fsck was calling
ext2fs_create_resize_inode() unconditionally, and depending on
s_reserved_gdt_blocks to be zero, instead of explicitly checking the
resize_inode feature.