Remove unused mrb_sprintf

src/error.c

@@ -264,22 +264,6 @@ mrb_name_error(mrb_state *mrb, mrb_sym id, const char *fmt, ...)
   mrb_exc_raise(mrb, exc);
 }
 
-mrb_value
-mrb_sprintf(mrb_state *mrb, const char *fmt, ...)
-{
-  va_list args;
-  char buf[256];
-  int n;
-
-  va_start(args, fmt);
-  n = vsnprintf(buf, sizeof(buf), fmt, args);
-  va_end(args);
-  if (n < 0) {
-    n = 0;
-  }
-  return mrb_str_new(mrb, buf, n);
-}
-
 void
 mrb_warn(const char *fmt, ...)
 {

src/error.h

@@ -13,7 +13,6 @@ int sysexit_status(mrb_state *mrb, mrb_value err);
 mrb_value mrb_exc_new3(mrb_state *mrb, struct RClass* c, mrb_value str);
 mrb_value make_exception(mrb_state *mrb, int argc, mrb_value *argv, int isstr);
 mrb_value mrb_make_exception(mrb_state *mrb, int argc, mrb_value *argv);
-mrb_value mrb_sprintf(mrb_state *mrb, const char *fmt, ...);
 void mrb_name_error(mrb_state *mrb, mrb_sym id, const char *fmt, ...);
 void mrb_exc_print(mrb_state *mrb, struct RObject *exc);