error.c: fix r49479

* error.c (rb_mod_sys_fail_str): copy the given format.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49483 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/error.c b/error.c
index 662c6d4bee..8cf343901c 100644
--- a/error.c
+++ b/error.c
@@ -2096,7 +2096,7 @@ rb_sys_warning(const char *fmt, ...)
 
     if (!RTEST(ruby_verbose)) return;
 
-    snprintf(buf+strlen(buf), BUFSIZ-strlen(buf), ": %s", strerror(errno_save));
+    snprintf(buf, BUFSIZ, "%s: %s", fmt, strerror(errno_save));
 
     va_start(args, fmt);
     warn_print(buf, args);