Some unnecessary assignments and unused variables.

client.c

@@ -644,7 +644,7 @@ client_read_open(void *data, size_t datalen)
 	struct msg_read_done	 reply;
 	struct client_file	 find, *cf;
 	const int		 flags = O_NONBLOCK|O_RDONLY;
-	int			 error = 0;
+	int			 error;
 
 	if (datalen < sizeof *msg)
 		fatalx("bad MSG_READ_OPEN size");

cmd-send-keys.c

@@ -152,7 +152,7 @@ cmd_send_keys_exec(struct cmd *self, struct cmdq_item *item)
 			return (CMD_RETURN_ERROR);
 		}
 		if (wme != NULL && (args_has(args, 'X') || args->argc == 0)) {
-			if (wme == NULL || wme->mode->command == NULL) {
+			if (wme->mode->command == NULL) {
 				cmdq_error(item, "not in a mode");
 				return (CMD_RETURN_ERROR);
 			}

key-string.c

@@ -229,10 +229,8 @@ key_string_lookup_string(const char *string)
 			key -= 64;
 		else if (key == 32)
 			key = 0;
-		else if (key == '?')
-			key = 127;
 		else if (key == 63)
-			key = KEYC_BSPACE;
+			key = 127;
 		else
 			return (KEYC_UNKNOWN);
 		modifiers &= ~KEYC_CTRL;

server-client.c

@@ -606,10 +606,9 @@ have_event:
 			wp = window_get_active_at(s->curw->window, px, py);
 			if (wp != NULL)
 				where = PANE;
+			else
+				return (KEYC_UNKNOWN);
 		}
-
-		if (where == NOWHERE)
-			return (KEYC_UNKNOWN);
 		if (where == PANE)
 			log_debug("mouse %u,%u on pane %%%u", x, y, wp->id);
 		else if (where == BORDER)
@@ -1543,7 +1542,7 @@ server_client_reset_state(struct client *c)
 	struct window_pane	*wp = w->active, *loop;
 	struct screen		*s;
 	struct options		*oo = c->session->options;
-	int			 mode, cursor = 0;
+	int			 mode, cursor;
 	u_int			 cx = 0, cy = 0, ox, oy, sx, sy;
 
 	if (c->flags & (CLIENT_CONTROL|CLIENT_SUSPENDED))

window-buffer.c

@@ -348,9 +348,8 @@ window_buffer_do_paste(void *modedata, void *itemdata, struct client *c,
 {
 	struct window_buffer_modedata	*data = modedata;
 	struct window_buffer_itemdata	*item = itemdata;
-	struct paste_buffer		*pb;
 
-	if ((pb = paste_get_name(item->name)) != NULL)
+	if (paste_get_name(item->name) != NULL)
 		mode_tree_run_command(c, NULL, data->command, item->name);
 }
 

window-copy.c

@@ -4151,7 +4151,6 @@ window_copy_cursor_previous_word_pos(struct window_mode_entry *wme,
 				    data->oy >=
 				    screen_hsize(data->backing) - 1))
 					goto out;
-				py--;
 
 				py = screen_hsize(data->backing) + data->cy -
 				    data->oy;