[radeonhd] Crashes at startup

[Nikos Chantziaras]

I just built radeonhd from Git (master branch).  It crashes at startup. 
  No fancy xorg.conf used, just Driver "radeonhd" and nothing else. 
X.Org 1.4.99.906. The hardware is an R580 (on x86-64).

Backtrace:
0: X(xf86SigHandler+0x65) [0x47eb05]
1: /lib/libc.so.6 [0x30004322c0]
2: /lib/libc.so.6(kill+0x7) [0x3000432527]
3: 
/usr/lib64/xorg/modules/drivers//radeonhd_drv.so(RhdAssertFailed+0x26) 
[0x7f28aeb2e026]
4: /usr/lib64/xorg/modules/drivers//radeonhd_drv.so [0x7f28aeb46946]
5: /usr/lib64/xorg/modules/drivers//radeonhd_drv.so [0x7f28aeb46a49]
6: /usr/lib64/xorg/modules/drivers//radeonhd_drv.so [0x7f28aeb3ea79]
7: X(xf86SetDesiredModes+0x4b) [0x4a334b]
8: 
/usr/lib64/xorg/modules/drivers//radeonhd_drv.so(RHDRandrModeInit+0x72) 
[0x7f28aeb3e382]
9: /usr/lib64/xorg/modules/drivers//radeonhd_drv.so [0x7f28aeb2b422]
10: X(AddScreen+0x1c8) [0x42c608]
11: X(InitOutput+0x240) [0x462c10]
12: X(main+0x286) [0x42cda6]
13: /lib/libc.so.6(__libc_start_main+0xe6) [0x300041e486]
14: X(FontFileCompleteXLFD+0x251) [0x42c359]