msm: kgsl: Fix ref counting error for syncsource object

In kgsl_ioctl_syncsource_create_fence(), when the return value is
-ENOMEM or -EBADF, an extra reference count is put back for
syncsource during cleanup. This results in an early free of
syncsource object. This can be fixed by avoiding the extra
kgsl_syncsource_put() during the cleanup.

Change-Id: I4ecbcd04dae6edb773b7979f68c9658a971d9d5d
Signed-off-by: Akhil P Oommen <akhilpo@codeaurora.org>