Merge branch 'dk/blame-janitorial'

Code clean-up. * dk/blame-janitorial: builtin/blame.c::find_copy_in_blob: no need to scan for region end blame.c: prepare_lines should not call xrealloc for every line builtin/blame.c::prepare_lines: fix allocation size of sb->lineno builtin/blame.c: eliminate same_suspect() builtin/blame.c: struct blame_entry does not need a prev link