Fix the following build failure when OPENSBI_PLAT is empty raised since
commit 9b5b7165de:
/usr/bin/install -m 0644 -D /nvmedata/autobuild/instance-4/output-1/build/opensbi-0.9/build/platform//firmware/fw_jump.bin /nvmedata/autobuild/instance-4/output-1/images/fw_jump.bin
/usr/bin/install: cannot stat '/nvmedata/autobuild/instance-4/output-1/build/opensbi-0.9/build/platform//firmware/fw_jump.bin': No such file or directory
Fixes:
- http://autobuild.buildroot.org/results/8033327f090e4a3d84a7fce1f62b14fdf89dbd89
Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>