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Fix off-by-one strncmp in e_sys_main.c #7

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TL;DR: The LDR_ string has length of 4, but we compare only 3 bytes (instead of 4).

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

TL;DR: The `LDR_` string has length of 4, but we compare only 3 bytes (instead of 4).

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