btrfs-progs v3.14 mkfs.btrfs bug: --features long-option segfaults, -O short-option OK

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Using btrfs-progs v3.14:

mkfs.btrfs ... --features ...

segfaults.

mkfs.btrfs ... -O ...

works fine.

* I used other long options, so it's not simply a problem parsing long 
options.

* I tried the long option with various features; none worked, including 
--features list-all with no other options.  That too segfaulted, tho -O 
list-all worked.

Segfault line as logged:

mkfs.btrfs[5231]: segfault at 0 ip 00007fb531c7ab1a sp 00007fffaf1a7a78 
error 4 in libc-2.19.so[7fb531bf8000+19a000]

btrfs-progs v3.14 from git on kernel v3.14 from git, gentoo/~amd64, built 
with gcc-4.8.2, using glibc-2.19.

-- 
Duncan - List replies preferred.   No HTML msgs.
"Every nonfree program has a lord, a master --
and if you use the program, he is your master."  Richard Stallman

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