[Nbd] [PATCH] build: Fix build with older gcc

[Eric Blake <eblake@...696...>]

gcc 4.4.7 (hello RHEL 6) complains about redefinition of typedefs,
as in:

gcc -std=gnu99 -DHAVE_CONFIG_H -I.  -DSYSCONFDIR='"/usr/local/etc"'  -g -O2  -g -O2 -MT nbd_client-buffer.o -MD -MP -MF .deps/nbd_client-buffer.Tpo -c -o nbd_client-buffer.o `test -f 'buffer.c' || echo './'`buffer.c
buffer.c:39: error: redefinition of typedef ‘buffer_t’
buffer.h:31: note: previous declaration of ‘buffer_t’ was here

The .c file only has to declare the struct being typedef'd, not
repeat the typedef declaration.

Signed-off-by: Eric Blake <eblake@...696...>
---
 buffer.c        | 4 ++--
 crypto-gnutls.c | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/buffer.c b/buffer.c
index e08efd8..491ff87 100644
--- a/buffer.c
+++ b/buffer.c
@@ -28,7 +28,7 @@ OTHER DEALINGS IN THE SOFTWARE.

 #include "buffer.h"

-typedef struct buffer
+struct buffer
 {
   char *buf;
   ssize_t size;
@@ -36,7 +36,7 @@ typedef struct buffer
   ssize_t ridx;
   ssize_t widx;
   int empty;
-} buffer_t;
+};

 /* the buffer is organised internally as follows:
  *
diff --git a/crypto-gnutls.c b/crypto-gnutls.c
index d885250..9ce394d 100644
--- a/crypto-gnutls.c
+++ b/crypto-gnutls.c
@@ -53,7 +53,7 @@ OTHER DEALINGS IN THE SOFTWARE.

 #define PRIORITY "NORMAL:-VERS-TLS-ALL:+VERS-TLS1.2"

-typedef struct tlssession
+struct tlssession
 {
   gnutls_certificate_credentials_t creds;
   gnutls_session_t session;
@@ -62,7 +62,7 @@ typedef struct tlssession
   int (*erroutfn) (void *opaque, const char *format, va_list ap);
   int debug;
   void *opaque;
-} tlssession_t;
+};

 #define BUF_SIZE 65536
 #define BUF_HWM ((BUF_SIZE*3)/4)
-- 
2.9.3