Remove new_bfd_ref

For gdb_bfd_ref_ptr, gdb already had a convenience function like the
new gdb_ref_ptr::new_reference -- called new_bfd_ref.  This patch
removes it in favor of the new common function.

While doing this I also noticed that the comment for gdb_bfd_open was
incorrect (in a way related to reference counting), so this patch
updates the comment as well.

ChangeLog
2018-04-30  Tom Tromey  <tom@tromey.com>

	* symfile-mem.c (symbol_file_add_from_memory): Use new_reference.
	* gdb_bfd.h (new_bfd_ref): Remove.
	(gdb_bfd_open): Update comment.
	* gdb_bfd.c (gdb_bfd_open, gdb_bfd_fopen, gdb_bfd_openr)
	(gdb_bfd_openw, gdb_bfd_openr_iovec, gdb_bfd_record_inclusion)
	(gdb_bfd_fdopenr): Use new_reference.
	* exec.c (exec_file_attach): Use new_reference.

1 files changed, 1 insertions, 1 deletions

diff --git a/gdb/exec.c b/gdb/exec.c
index f94c15f..b529b7a 100644
--- a/gdb/exec.c
+++ b/gdb/exec.c
@@ -246,7 +246,7 @@ exec_file_attach (const char *filename, int from_tty)
   /* First, acquire a reference to the current exec_bfd.  We release
      this at the end of the function; but acquiring it now lets the
      BFD cache return it if this call refers to the same file.  */
-  gdb_bfd_ref_ptr exec_bfd_holder = new_bfd_ref (exec_bfd);
+  gdb_bfd_ref_ptr exec_bfd_holder = gdb_bfd_ref_ptr::new_reference (exec_bfd);
 
   /* Remove any previous exec file.  */
   exec_close ();