[Math] Fix warning in TMinuit::mnplot() function
[Math] Fix warning in TMinuit::mnplot() function

math/minuit/src/TMinuit.cxx:6077:6: warning:
   ‘__builtin___snprintf_chk’ output may be truncated
   before the last format character

In file included from /usr/include/stdio.h:938:0,
                 from root/math/minuit/src/TMinuit.cxx:335:
/usr/include/bits/stdio2.h:65:44: note:
   ‘__builtin___snprintf_chk’ output between 11 and 12 bytes
   into a destination of size 10

The warning means that numbers to be printed will be truncated,
which may produce wrong results due to the narrow columns of
only 10 characters width. This uses printf rather than snprintf
to avoid this problem.

olifre/root,mhuwiler/rootauto,zzxuanyuan/root,mhuwiler/rootauto,zzxuanyuan/root,karies/root,zzxuanyuan/root,olifre/root,mhuwiler/rootauto,karies/root,karies/root,simonpf/root,root-mirror/root,mhuwiler/rootauto,zzxuanyuan/root,mhuwiler/rootauto,simonpf/root,zzxuanyuan/root,karies/root,zzxuanyuan/root,karies/root,zzxuanyuan/root,olifre/root,zzxuanyuan/root,root-mirror/root,root-mirror/root,zzxuanyuan/root,olifre/root,karies/root,root-mirror/root,mhuwiler/rootauto,mhuwiler/rootauto,simonpf/root,root-mirror/root,karies/root,root-mirror/root,mhuwiler/rootauto,simonpf/root,olifre/root,simonpf/root,simonpf/root,root-mirror/root,olifre/root,root-mirror/root,olifre/root,olifre/root,karies/root,karies/root,olifre/root,olifre/root,simonpf/root,mhuwiler/rootauto,root-mirror/root,simonpf/root,karies/root,karies/root,mhuwiler/rootauto,zzxuanyuan/root,mhuwiler/rootauto,zzxuanyuan/root,simonpf/root,olifre/root,simonpf/root,root-mirror/root,simonpf/root,zzxuanyuan/root,root-mirror/root