[PATH] xf86-silicon-driver: fix segfault on LynxE chipset

[Matthieu Herrb]

This patch fixes a segfault on LynxE chipsets and any other chipset
where IOBase is NULL:

Program received signal SIGSEGV, Segmentation fault.
0x0ea165aa in SMILynx_OutputDetect_crt (output=0x7c2ed580) at
/usr/xenocara/driver/xf86-video-siliconmotion/src/smilynx_output.c:215
215         status = MMIO_IN8(pSmi->IOBase, 0x3C2) & 0x10;
(gdb) bt
#0  0x0ea165aa in SMILynx_OutputDetect_crt (output=0x7c2ed580) at
/usr/xenocara/driver/xf86-video-siliconmotion/src/smilynx_output.c:215
#1  0x1c0af811 in xf86ProbeOutputModes (scrn=0x883d9800, maxX=4096,
maxY=4096) at /usr/xenocara/xserver/hw/xfree86/modes/xf86Crtc.c:1426
#2  0x1c0b0e5d in xf86InitialConfiguration (scrn=0x883d9800, canGrow=0)
at /usr/xenocara/xserver/hw/xfree86/modes/xf86Crtc.c:2091
#3  0x0ea0bb97 in SMI_PreInit (pScrn=0x883d9800, flags=0) at
/usr/xenocara/driver/xf86-video-siliconmotion/src/smi_driver.c:935
#4  0x1c063ad0 in InitOutput (pScreenInfo=0x3c04b020, argc=1,
argv=0xcfbdc508) at /usr/xenocara/xserver/hw/xfree86/common/xf86Init.c:962
#5  0x1c021778 in main (argc=1, argv=0xcfbdc508, envp=0xcfbdc510) at
/usr/xenocara/xserver/dix/main.c:358
(gdb) quit

-- 
Matthieu Herrb
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