Fix more leaks

- get_parent_pid: free buffer returned from read_line after use.
 - workspace_for_pid: ensure free_pid_workspace is called when
   pid_workspaces are removed from config->pid_workspaces.
 - cmd_split: return the cmd_results from _do_split, so that the
   parent function may free it.

common/util.c

@@ -96,6 +96,7 @@ pid_t get_parent_pid(pid_t child) {
 			parent = strtol(token, NULL, 10);
 		}
 
+		free(buffer);
 		fclose(stat);
 	}
 

sway/commands/split.c

@@ -62,22 +62,21 @@ struct cmd_results *cmd_split(int argc, char **argv) {
 		return error;
 	}
 	if (strcasecmp(argv[0], "v") == 0 || strcasecmp(argv[0], "vertical") == 0) {
-		_do_split(argc - 1, argv + 1, L_VERT);
+		return _do_split(argc - 1, argv + 1, L_VERT);
 	} else if (strcasecmp(argv[0], "h") == 0 || strcasecmp(argv[0], "horizontal") == 0) {
-		_do_split(argc - 1, argv + 1, L_HORIZ);
+		return _do_split(argc - 1, argv + 1, L_HORIZ);
 	} else if (strcasecmp(argv[0], "t") == 0 || strcasecmp(argv[0], "toggle") == 0) {
 		swayc_t *focused = current_container;
 		if (focused->parent->layout == L_VERT) {
-			_do_split(argc - 1, argv + 1, L_HORIZ);
+			return _do_split(argc - 1, argv + 1, L_HORIZ);
 		} else {
-			_do_split(argc - 1, argv + 1, L_VERT);
+			return _do_split(argc - 1, argv + 1, L_VERT);
 		}
 	} else {
 		error = cmd_results_new(CMD_FAILURE, "split",
 			"Invalid split command (expected either horizontal or vertical).");
 		return error;
 	}
-	return cmd_results_new(CMD_SUCCESS, NULL, NULL);
 }
 
 struct cmd_results *cmd_splitv(int argc, char **argv) {

sway/workspace.c

@@ -368,6 +368,7 @@ swayc_t *workspace_for_pid(pid_t pid) {
 			ws = workspace_create(pw->workspace);
 		}
 
+		free_pid_workspace(pw);
 		list_del(config->pid_workspaces, i);
 	}