LP:609803 - xtradb compiler warnings

xtradb in MariaDB has compiler warnings. Official InnoDB has none.

From mariadb-5.1.42:

btr/btr0cur.c:3305: warning: value computed is not used
btr/btr0cur.c:3236: warning: ‘n_not_nulls’ may be used uninitialized in this function
fil/fil0fil.c:3101: warning: pointer targets in passing argument 2 of ‘dict_table_get_index_on_name’ differ in signedness
handler/i_s.cc:2991: warning: unused variable ‘cs’
log/log0recv.c:3283: warning: unused variable ‘file’
os/os0file.c:4194: warning: pointer targets in assignment differ in signedness
srv/srv0srv.c:1123: warning: value computed is not used
srv/srv0srv.c:1153: warning: value computed is not used
srv/srv0srv.c:1360: warning: value computed is not used
sync/sync0sync.c:426: warning: unused variable ‘ptr’

From latest bzr code for lp:maria/5.2

warnings for storage/xtradb

btr/btr0btr.c:2871: warning: null argument where non-null required (argument 1)
btr/btr0cur.c:1841: warning: null argument where non-null required (argument 2)
btr/btr0cur.c:1860: warning: null argument where non-null required (argument 1)
btr/btr0cur.c:1967: warning: null argument where non-null required (argument 1)
fil/fil0fil.c:3106: warning: pointer targets in passing argument 2 of 'dict_table_get_index_on_name' differ in signedness
ibuf/ibuf0ibuf.c:775: warning: null argument where non-null required (argument 1)
ibuf/ibuf0ibuf.c:950: warning: null argument where non-null required (argument 1)
os/os0file.c:4194: warning: pointer targets in assignment differ in signedness
srv/srv0srv.c:1129: warning: value computed is not used
srv/srv0srv.c:1159: warning: value computed is not used
srv/srv0srv.c:1366: warning: value computed is not used

storage/innodb_plugin has no warnings for the same branch