"payload read failed" for xz rpms > 2^25 byte in size

[fholzer]

I get "payload read failed" for my xz compressed input rpms that are ~95M in size. I found that this can be resolved by changing the memory limit from 1<<25 to 1<<27 which is hard-coded here.
The is actually not triggered when lzma_auto_decoder is called, but when crread_lz is called, where cfile_readbuf returns LZMA_MEMLIMIT_ERROR.