channels: Move ssh_channel_write_stderr out of server-only

Signed-off-by: Aris Adamantiadis <aris@0xbadc0de.be>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>

include/libssh/libssh.h

@@ -414,6 +414,9 @@ LIBSSH_API void ssh_channel_set_blocking(ssh_channel channel, int blocking);
 LIBSSH_API void ssh_channel_set_counter(ssh_channel channel,
                                         ssh_counter counter);
 LIBSSH_API int ssh_channel_write(ssh_channel channel, const void *data, uint32_t len);
+LIBSSH_API int ssh_channel_write_stderr(ssh_channel channel,
+                                        const void *data,
+                                        uint32_t len);
 LIBSSH_API uint32_t ssh_channel_window_size(ssh_channel channel);
 
 LIBSSH_API char *ssh_basename (const char *path);

include/libssh/server.h

@@ -316,9 +316,6 @@ LIBSSH_API int ssh_channel_request_send_exit_signal(ssh_channel channel,
                                                 int core,
                                                 const char *errmsg,
                                                 const char *lang);
-LIBSSH_API int ssh_channel_write_stderr(ssh_channel channel,
-                                                const void *data,
-                                                uint32_t len);
 
 LIBSSH_API int ssh_send_keepalive(ssh_session session);
 

src/channels.c

@@ -3192,7 +3192,6 @@ void ssh_channel_set_counter(ssh_channel channel,
     }
 }
 
-#if WITH_SERVER
 /**
  * @brief Blocking write on a channel stderr.
  *
@@ -3210,6 +3209,8 @@ int ssh_channel_write_stderr(ssh_channel channel, const void *data, uint32_t len
   return channel_write_common(channel, data, len, 1);
 }
 
+#if WITH_SERVER
+
 /**
  * @brief Open a TCP/IP reverse forwarding channel.
  *