encoding.h: constify rb_encoding

* include/ruby/encoding.h: constify `rb_encoding` itself, not only
  arguments.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46322 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/error.c b/error.c
index 79c36c5171..71375c3bea 100644
--- a/error.c
+++ b/error.c
@@ -1891,7 +1891,7 @@ Init_Exception(void)
 }
 
 void
-rb_enc_raise(const rb_encoding *enc, VALUE exc, const char *fmt, ...)
+rb_enc_raise(rb_encoding *enc, VALUE exc, const char *fmt, ...)
 {
     va_list args;
     VALUE mesg;