flash: nand: prepare for aligning switch and case statements

To prepare for aligning switch and case statements, fix in advance
some checkpatch error due to existing code:
- remove useless parenthesis;
- don't end line with an open parenthesis;
- expand multiple assignments.

While there, put the 'default' case as last in the list.

Change-Id: I17bf5e88b145ef9b5b188424182f4e54b818eeae
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/9011
Tested-by: jenkins

src/flash/nand/tcl.c

@@ -50,21 +50,22 @@ COMMAND_HANDLER(handle_nand_info_command)
 	int last = -1;
 
 	switch (CMD_ARGC) {
-		default:
-			return ERROR_COMMAND_SYNTAX_ERROR;
 		case 1:
 			first = 0;
 			last = INT32_MAX;
 			break;
 		case 2:
 			COMMAND_PARSE_NUMBER(int, CMD_ARGV[1], i);
-			first = last = i;
+			first = i;
+			last = i;
 			i = 0;
 			break;
 		case 3:
 			COMMAND_PARSE_NUMBER(int, CMD_ARGV[1], first);
 			COMMAND_PARSE_NUMBER(int, CMD_ARGV[2], last);
 			break;
+		default:
+			return ERROR_COMMAND_SYNTAX_ERROR;
 	}
 
 	struct nand_device *p;