core: fix Ubuntu code audit (cppcheck) results

These block inclusion in Ubuntu Main repo.

AFAICT these are false positives:

[rpc/rpc-transport/rdma/src/rdma.c:3074]: (error) Address of local auto-variable assigned to a function parameter.
[xlators/features/marker/utils/src/gsyncd.c:99]: (error) Memory leak: str
[xlators/features/marker/utils/src/gsyncd.c:354]: (error) Memory leak: argv
[xlators/nfs/server/src/nlm4.c:1176]: (error) Possible null pointer dereference: fde

The remainder are fixed with this change-set:

[api/src/glfs-fops.c:700]: (error) Possible null pointer dereference: gio
[api/src/glfs-fops.c:702]: (error) Possible null pointer dereference: frame
[xlators/cluster/afr/src/afr-inode-write.c:375]: (error) Possible null pointer dereference: frame
[xlators/cluster/afr/src/afr-self-heal-common.c:1522]: (error) Possible null pointer dereference: local
[xlators/cluster/dht/src/dht-rebalance.c:1574]: (error) Possible null pointer dereference: ctx
[xlators/cluster/stripe/src/stripe.c:4407]: (error) Possible null pointer dereference: local
[xlators/mgmt/glusterd/src/glusterd-mountbroker.c:675]: (error) Possible null pointer dereference: cookieswitch
[xlators/mgmt/glusterd/src/glusterd-mountbroker.c:677]: (error) Possible null pointer dereference: cookieswitch
[xlators/mgmt/glusterd/src/glusterd-replace-brick.c:924]: (error) Resource leak: file
[xlators/mgmt/glusterd/src/glusterd-replace-brick.c:1008]: (error) Resource leak: file
[xlators/mgmt/glusterd/src/glusterd-sm.c:248]: (error) Possible null pointer dereference: new_ev_ctx
[xlators/mgmt/glusterd/src/glusterd-store.c:1250]: (error) Possible null pointer dereference: handle
[xlators/mgmt/glusterd/src/glusterd-utils.c:4272]: (error) Possible null pointer dereference: this
[xlators/mgmt/glusterd/src/glusterd-utils.c:5113]: (error) Possible null pointer dereference: this
[xlators/mount/fuse/src/fuse-bridge.c:4432]: (error) Uninitialized variable: finh
[xlators/mount/fuse/src/fuse-bridge.c:2927]: (error) Possible null pointer dereference: state
[xlators/mount/fuse/src/fuse-bridge.c:3226]: (error) Possible null pointer dereference: state
[xlators/storage/bd_map/src/bd_map.c:1504]: (error) Possible null pointer dereference: bd_fd
[xlators/storage/bd_map/src/bd_map.c:1728]: (error) Possible null pointer dereference: n_entry
[xlators/storage/bd_map/src/bd_map.c:1741]: (error) Possible null pointer dereference: n_entry
[xlators/performance/quick-read/src/quick-read.c:585]: (error) Possible null pointer dereference: iobuf

rerunning cppcheck --force afterwards:

Test code, don't care:
[extras/test/test-ffop.c:27]: (error) Buffer overrun possible for long command line arguments.

False positive after fix
[xlators/cluster/stripe/src/stripe.c:4407]: (error) Possible null pointer dereference: local

Still false positive:
[xlators/features/marker/utils/src/gsyncd.c:354]: (error) Memory leak: argv
[xlators/nfs/server/src/nlm4.c:1176]: (error) Possible null pointer dereference: fde

Not built, don't care:
[xlators/cluster/ha/src/ha.c:2699]: (error) Possible null pointer dereference: priv

Change-Id: I1fb849e9c042d3a3701cb05121d413e58e73d505
BUG: 1086460
Signed-off-by: Kaleb S. KEITHLEY <kkeithle@redhat.com>
Reviewed-on: http://review.gluster.org/7583
Reviewed-by: Vijay Bellur <vbellur@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>