[Patch] Simplify basic_stringbuf::seekoff

[Paolo Carlini]

Hi,

this is the first of two patches affecting basic_stringbuf::seekoff
and seekpos (the other one is more substantial)

Consider, f.i., __endi: when it's actually used, in the last 'if',
it's always equal to _M_in_end; __newoffi, likewise, which depends
on __endi, is used only when __endi is assigned _M_in_end.

Overall, this saves 4 varibles and two 'if', doesn't seem to worsen
that much the clarity.

Tested x86-linux. Ok with you?

Paolo.

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