illumos gate

Building with gcc 6:

ncab2clf.c: In function 'read_n_bytes':
ncab2clf.c:477:4: error: this 'else' clause does not guard... [-Werror=misleading-indentation]
    else
    ^~~~
ncab2clf.c:482:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'else'
     return (-1); /* some wierd interrupt */
     ^~~~~~
ncab2clf.c: In function 'write_n_bytes':
ncab2clf.c:512:4: error: this 'else' clause does not guard... [-Werror=misleading-indentation]
    else
    ^~~~
ncab2clf.c:517:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'else'
     return (-1); /* some wierd interrupt */
     ^~~~~~
cc1: all warnings being treated as errors