[Suggestion] parisc: about the warnings "unsigned expression < 0 is always false"

[Chen Gang <gang.chen@xxxxxxxxxxx>]

Hello Maintainers:

Are the warnings real issue (I guess so, but don't know how to fix) ?

Please help check, thanks.

The cross compiler is built from (gcc-4.9.0 and binutils-2.23.2 with
'hppa-gchen-linux'), the related warnings (for 'allmodconfig'):

In file included from arch/parisc/math-emu/fmpyfadd.c:50:0:
arch/parisc/math-emu/fmpyfadd.c: In function 'dbl_fmpyfadd':
arch/parisc/math-emu/dbl_float.h:755:30: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
  if ((unsigned int)(src1dstD += (src2D)) < (unsigned int)(src2D)) { \
                              ^
arch/parisc/math-emu/fmpyfadd.c:394:4: note: in expansion of macro 'Fourword_add'
    Fourword_add(tmpresp1, tmpresp2, tmpresp3, tmpresp4,
    ^
arch/parisc/math-emu/dbl_float.h:765:33: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
     if ((unsigned int)(src1dstC += (src2C)) <   \
   
                              ^
:-)

Thanks.
--
Chen Gang
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