Unexpected value of d_name cause false positive

[dmknght]

Bug lines:

• https://github.com/dmknght/rkcheck/blob/main/src/engine/scan_file.nim#L154
• https://github.com/dmknght/rkcheck/blob/main/src/engine/scan_file.nim#L181

Problem: When read a dir that has too many nodes, sometime d_reclen gives unexpected value to parse node name, hence false positives happen.
In most of the case (99.99%) d_reclen gives expected value. This bug is rare based on number of entries (1 or 2 times / 5k entries)