* sprintf.c (rb_sprintf): fixed typo.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@8839 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

sprintf.c

@@ -894,7 +894,7 @@ VALUE
 #ifdef HAVE_STDARG_PROTOTYPES
 rb_sprintf(const char *format, ...)
 #else
-ruby_sprintf(format, va_alist)
+rb_sprintf(format, va_alist)
     const char *format;
     va_dcl
 #endif