The fstat function could return a value that indicates an error condition.
If this is not checked, the error condition may not be handled correctly.
Coverity issue: 195019
Fixes: f37d8a4b67b2 ("net/nfp: add NSP FW upload command")
Signed-off-by: Alejandro Lucero <alejandro.lucero@netronome.com>
f5cba91b09