tools: kwboot: Reserve enough space for patching kwbimage in memory

SPI image header and data parts do not have to be aligned to 128 byte
xmodem block size. So reserve additional memory for aligning header part
and additional memory for aligning data part.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>

tools/kwboot.c

@@ -1672,8 +1672,10 @@ main(int argc, char **argv)
 	else
 		/* ensure we have enough space for baudrate change code */
 		after_img_rsv += KWBOOT_BAUDRATE_BIN_HEADER_SZ +
+				 KWBOOT_XM_BLKSZ +
 				 sizeof(kwboot_pre_baud_code) +
-				 sizeof(kwboot_baud_code);
+				 sizeof(kwboot_baud_code) +
+				 KWBOOT_XM_BLKSZ;
 
 	if (imgpath) {
 		img = kwboot_read_image(imgpath, &size, after_img_rsv);