insmod: Fix loading if no parameters
insmod: Fix loading if no parameters

Currently insmod failed with a Bummer/index out of range message when
the module did not have any parameters (e.g., insmod ./hello.ko). The
"options" string was empty, but accessed at index 0. Use
BytePtrFromString, which handles that case.

Signed-off-by: Roland Kammerer <fc1b6c555e62f23cda4483d0e5d86d0756465080@gmail.com>

u-root/u-root,u-root/u-root,hugelgupf/u-root,GanShun/u-root,rminnich/u-root,GanShun/u-root,GanShun/u-root,rminnich/u-root,rminnich/u-root,u-root/u-root,rminnich/u-root,hugelgupf/u-root,hugelgupf/u-root,hugelgupf/u-root