packet: Fix fallthrough compiler warnings

Signed-off-by: Andreas Schneider <asn@cryptomilk.org>

include/libssh/priv.h

@@ -383,6 +383,14 @@ int ssh_connector_remove_event(ssh_connector connector);
 # endif
 #endif
 
+#ifndef FALL_THROUGH
+# ifdef HAVE_FALLTHROUGH_ATTRIBUTE
+#  define FALL_THROUGH __attribute__ ((fallthrough))
+# else /* HAVE_FALLTHROUGH_ATTRIBUTE */
+#  define FALL_THROUGH
+# endif /* HAVE_FALLTHROUGH_ATTRIBUTE */
+#endif /* FALL_THROUGH */
+
 void ssh_agent_state_free(void *data);
 
 #endif /* _LIBSSH_PRIV_H */

src/packet.c

@@ -220,7 +220,7 @@ int ssh_packet_socket_callback(const void *data, size_t receivedlen, void *user)
             /* Saves the status of the current operations */
             session->in_packet.len = len;
             session->packet_state = PACKET_STATE_SIZEREAD;
-            /* FALL TROUGH */
+            FALL_THROUGH;
         case PACKET_STATE_SIZEREAD:
             len = session->in_packet.len;
             to_be_read = len - blocksize + sizeof(uint32_t) + current_macsize;