classes: bundle: fix image copy error handling
classes: bundle: fix image copy error handling

This code had multiple flaws. The first one is that bb.build.FuncFailed
was removed in oe-core commit efe87ce4b2154c6f1c591ed9d8f770c229b044ad.

The reason why this did not trigger an error is that the raise statement
was nearly unreachable as it only checked if the just-copied file
exists. This should normally always be the case.

Last but not least, also the error message that would have been printed
did not reflect the actual behavior of the code but still noted about
symlink creation failures.

Thus we replace this all by what the code should actually do: Check if
the image we want to copy actually exists in DEPLOY_DIR_IMAGE and issue
a fatal error otherwise. We can simply do this with bb.fatal().

Signed-off-by: Enrico Jorns <a2e5f936c390f36494e46e71bcfbe365bb1e8c49@pengutronix.de>

rauc/meta-rauc,rauc/meta-rauc,rauc/meta-rauc,rauc/meta-rauc