preload: Fix strncmp off-by-one (#114)
preload: Fix strncmp off-by-one (#114)

The `"/proc/"` string is of len 6 instead of 5.

This was found with a "cstrnfinder" research and I haven't tested this change (more info https://twitter.com/disconnect3d_pl/status/1339757359896408065).
martinpitt/umockdev,martinpitt/umockdev,martinpitt/umockdev