remove duplication in warning

* dir.c (sys_warning_1): remove duplication in the message.
* error.c (rb_mod_sys_fail_str): ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49479 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

dir.c

@@ -1081,7 +1081,7 @@ dir_s_rmdir(VALUE obj, VALUE dir)
 static VALUE
 sys_warning_1(VALUE mesg)
 {
-    rb_sys_warning("%s:%s", strerror(errno), (const char *)mesg);
+    rb_sys_warning("%s", (const char *)mesg);
     return Qnil;
 }
 

error.c

@@ -2096,7 +2096,6 @@ rb_sys_warning(const char *fmt, ...)
 
     if (!RTEST(ruby_verbose)) return;
 
-    snprintf(buf, BUFSIZ, "warning: %s", fmt);
     snprintf(buf+strlen(buf), BUFSIZ-strlen(buf), ": %s", strerror(errno_save));
 
     va_start(args, fmt);