[PATCH] fix early SAL init for sn2

sn2 does early initialization of the SAL so it can use it for early console 
support.  Unfortunately, the loop to find the SAL entry point was buggy so 
when we tried out new EFI and SAL system table layouts, the loop didn't 
terminate.  Here's the fix (doh!, use two different loop counters instead of 
one and just return if we find the SAL entry point).

Signed-off-by: Jesse Barnes <jbarnes@sgi.com>

Thanks,
Jesse

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