Bug fix.

singularity-do-not-run-directly: /opt/secondlife/viewers/singularity/SingularityViewer/linden/indra/llcommon/llmemory.h:219: void ll_memcpy_nonaliased_aligned_16(char*, const char*, size_t): Assertion `src != __null' failed.

Program received signal SIGABRT, Aborted.
[Switching to Thread 0x7fff3342f700 (LWP 18001)]
0x00007ffff0f951d5 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
56      ../nptl/sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) bt
    file=file@entry=0x2c7ca40 "/opt/secondlife/viewers/singularity/SingularityViewer/linden/indra/llcommon/llmemory.h", line=line@entry=219,
    function=function@entry=0x2c7dc60 "void ll_memcpy_nonaliased_aligned_16(char*, const char*, size_t)") at assert.c:92
    line=219, function=0x2c7dc60 "void ll_memcpy_nonaliased_aligned_16(char*, const char*, size_t)") at assert.c:101
    at /opt/secondlife/viewers/singularity/SingularityViewer/linden/indra/llcommon/llmemory.h:219
    at /opt/secondlife/viewers/singularity/SingularityViewer/linden/indra/llmath/llvector4a.cpp:44
    at /opt/secondlife/viewers/singularity/SingularityViewer/linden/indra/llmath/llvolume.cpp:6106
    at /opt/secondlife/viewers/singularity/SingularityViewer/linden/indra/llprimitive/llmodel.cpp:829
    at /opt/secondlife/viewers/singularity/SingularityViewer/linden/indra/llcommon/llthread.cpp:93

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