libelf: Fix possible memory leak in elf_getdata_rawchunk

libelf: Fix possible memory leak in elf_getdata_rawchunk

If the rawchunk is not properly aligned we'll create a new buffer
that is correctly aligned and put the data in that new buffer with
memcpy or the conversion function. In such cases the rawchunk leaks
because the new buffer is put into the Elf_Data_Chunk.

	* libelf/elf_getdata_rawchunk.c (elf_getdata_rawchunk):
	Call free on the rawchunk if new buffer was allocated.

Signed-off-by: Mark Wielaard <mark@klomp.org>