SeekToEndOfRecord() now doesn't seek to EOF if the offset is too large;
break out of loops in the obvious cases where this could be problematic.

But don't use SAL_WARN_UNUSED_RESULT because unfortunately GCC doesn't
allow to explicitly suppress that with a (void) cast.

Change-Id: Ie0211075bf0f4ef271bb26bdfead5fb070875a2b