Fix a bug about searching FS% file system failure in shell1.0.
Fix a bug about searching FS% file system failure in shell1.0.

Signed-off-by: Jin Eric <28f988db17ff8624705e2c502b9148c9beb8c8f0@intel.com>

tianocore/edk2-test,tianocore/edk2-test,tianocore/edk2-test