avoid bogus format-overflow errorHEADmaster

Seen on x86_64-linux Ubuntu 24.04.2 using gcc-13.3.0 with
CFLAGS="-m32 -g -O2 -fsanitize=address,undefined"

In function ‘sprintf’,
    inlined from ‘s_mri_for’ at gas/config/tc-m68k.c:6941:5:
/usr/include/bits/stdio2.h:30:10: error: null destination pointer [-Werror=format-overflow=]
   30 |   return __builtin___sprintf_chk (__s, __USE_FORTIFY_LEVEL - 1,
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   31 |                                   __glibc_objsize (__s), __fmt,
      |                                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   32 |                                   __va_arg_pack ());
      |                                   ~~~~~~~~~~~~~~~~~

Rewrite the code without sprintf, as in other parts of s_mri_for.
See also commit 760fb390fd4c and following commits.

Note that adding -D_FORTIFY_SOURCE=0 to CFLAGS (which is a good idea
when building with sanitizers) merely transforms the sprintf_chk error
here into one regarding plain sprintf.

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