Possible tls bug on arm / microblaze

[Sam Price]

On microblaze i was getting a

ESR: Unaligned data access exception

I narrowed this down to this "ti->offset;" being uninitialized in the
following two bsps

https://git.rtems.org/rtems/tree/cpukit/score/cpu/microblaze/__tls_get_addr.c
Also this file
cpukit/score/cpu/arm/__tls_get_addr.c

I tried recompiling with this on the microblaze build with offset being
renamed to offseta.
This only caused a compilation error in the __tls_get_addr function.
So I think this variable is being used without being initialized or ever
changed.
Is it safe to just remove the offset variable?

-- 
Thank you,

Sam Price
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