declare favorite child as int instead of unsigned int
declare favorite child as int instead of unsigned int

In afr_private_t structure favorite child is declared as unsigned int.
In init function of afr we set favorite child to -1, if that option is
not found in volfile. But favorite child value will be set to a huge
value instead of -1 since it is an unsigned int and in statedump file
favorite child value is displayed as a huge value instead of -1.

Signed-off-by: Raghavendra Bhat <raghavendrabhat@gluster.com>
Signed-off-by: Anand Avati <avati@gluster.com>

BUG: 2668 ([glusterfs-3.2.9qa7]: createbench error)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=2668

Kaushikbv/Gluster,Kaushikbv/Gluster,Kaushikbv/Gluster