Capture the "[mktplinkfw] *** error: images are too big" error when building an image

[nicopace]

When creating an image that is bigger than the available space, the command outputs an error, but at the end the command says it is successful.

This is the last part of the output, it says that it is too big by 158546 bytes:

	root (0)
4801+1 records in
4801+1 records out
2458274 bytes (2.5 MB, 2.3 MiB) copied, 0.0076228 s, 322 MB/s
[mktplinkfw] kernel length aligned to 1369776
[mktplinkfw] *** error: images are too big by 158546 bytes
cp: cannot stat '/home/nicopace/projects/redlibre/altermundi/librestack/lime-sdk/lede/ar71xx/generic/ib/build_dir/target-mips_24kc_musl/linux-ar71xx_generic/tmp/lede-lime-mini-ar71xx-generic-tl-mr3020-v1-squashfs-sysupgrade.bin': No such file or directory
4801+1 records in
4801+1 records out
2458274 bytes (2.5 MB, 2.3 MiB) copied, 0.008946 s, 275 MB/s
[mktplinkfw] kernel length aligned to 1369776
[mktplinkfw] *** error: images are too big by 158546 bytes
cp: cannot stat '/home/nicopace/projects/redlibre/altermundi/librestack/lime-sdk/lede/ar71xx/generic/ib/build_dir/target-mips_24kc_musl/linux-ar71xx_generic/tmp/lede-lime-mini-ar71xx-generic-tl-mr3020-v1-squashfs-factory.bin': No such file or directory
padding image to 00260000
padding image to 00259000
padding image to 0025a000
padding image to 0025c000
padding image to 00260000
padding image to 00280000
20+1 records in
21+0 records out
2752512 bytes (2.8 MB, 2.6 MiB) copied, 0.00204403 s, 1.3 GB/s

Calculating checksums...
make: Leaving directory '/home/nicopace/projects/redlibre/altermundi/librestack/lime-sdk/lede/ar71xx/generic/ib'

-> Firmware for target ar71xx/generic, profile PROFILE=tl-mr3020-v1 and flavor lime_mini cooked!
Find the binaries in /home/nicopace/projects/redlibre/altermundi/librestack/lime-sdk/output/ar71xx/generic/tl-mr3020-v1/lime_mini directory

(based on libremesh/lime-packages#194 (comment) and libremesh/lime-packages#194 (comment))