Fix conditional test in 02_configure.sh script

Fix a conditional statement that returns an error although the
command ran successfully. Fortunately, this did not affect the
functionality and logic in the script but it generated extra
noise on the console logs that are unnecessary and potentially
confusing to users.

Signed-off-by: Geoffroy Van Cutsem <geoffroy.vancutsem@intel.com>
Change-Id: Ic59c09e2b2890af37bbb023d0b372baa2f718c2d