setlogincontext(): Comply to style(9)

[olce]

Summary

Remove indentation by inverting the big 'if (lc)' and using 'return'.
Use explicit binary operators to produce booleans.

[olce]

Update the diff following update of D40344. Same final result.

[dchagin]

lib/libutil/login_class.c

402

if ((flags & LOGIN_SETUMASK) != 0) {

and below

[olce]

Explicit booleans in tests.

[olce]

lib/libutil/login_class.c

402

And above as well. Thanks.

[kib]

lib/libutil/login_class.c

418

There should be a blank line between locals block and first statement.

431

Same

[olce]

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