Crashes with latest font code

[Romain Francoise]

Richard's latest changes to the font handling code (which are not
documented in src/ChangeLog) cause very reliable crashes with my setup.
Starting Gnus or loading my w3m session is enough to cause a segfault.

The backtrace is as follows:

#0  0xffffe410 in __kernel_vsyscall ()
#1  0xa763ab16 in kill () from /lib/tls/i686/cmov/libc.so.6
#2  0x081244fc in fatal_error_signal (sig=11) at emacs.c:430
#3  <signal handler called>
#4  0x080e6b7c in best_matching_font (f=0x86a9b60, attrs=0x8be8ba0, 
    fonts=0xa630f58, nfonts=1, width_ratio=1, needs_overstrike=0xafefdd18)
    at xfaces.c:6684
#5  0x080e721c in choose_face_font (f=0x86a9b60, attrs=0x8be8ba0, fontset=2, 
    c=294912, needs_overstrike=0xafefdd18) at xfaces.c:6910
#6  0x080de15c in load_face_font (f=0x86a9b60, face=0x8be8b58, c=294912)
    at xfaces.c:1257
#7  0x080e7ab7 in realize_face (cache=0x86acd68, attrs=0x98412f8, c=294912, 
    base_face=0x98412b0, former_face_id=-1) at xfaces.c:7166
#8  0x080e4fd6 in lookup_face (f=0x86a9b60, attr=0x98412f8, c=294912, 
    base_face=0x98412b0) at xfaces.c:5687
[...]

I can provide more info if needed.

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Romain Francoise <address@hidden> | The sea! the sea! the open
it's a miracle -- http://orebokech.com/ | sea! The blue, the fresh, the
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