flash/xmc4xxx: use COMMAND_PARSE_NUMBER in command handlers

the usage of COMMAND_PARSE_NUMBER is safer in COMMAND_HANDLERs since it provides
better error checking than strto** functions.

Change-Id: Ibfe95ce73f147f467de8de23e9573ef0179aed96
Signed-off-by: Tarek BOCHKATI <tarek.bouchkati@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/6421
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
Tested-by: jenkins

src/flash/nor/xmc4xxx.c

@@ -1268,12 +1268,12 @@ COMMAND_HANDLER(xmc4xxx_handle_flash_password_command)
 	errno = 0;
 
 	/* We skip over the flash bank */
-	fb->pw1 = strtol(CMD_ARGV[1], NULL, 16);
+	COMMAND_PARSE_NUMBER(u32, CMD_ARGV[1], fb->pw1);
 
 	if (errno)
 		return ERROR_COMMAND_SYNTAX_ERROR;
 
-	fb->pw2 = strtol(CMD_ARGV[2], NULL, 16);
+	COMMAND_PARSE_NUMBER(u32, CMD_ARGV[2], fb->pw2);
 
 	if (errno)
 		return ERROR_COMMAND_SYNTAX_ERROR;