msm: kgsl: Fix Z180 memory leak

Decerement entry refcount, which incremented
in kgsl_sharedmem_find_region.

CRs-Fixed: 635747
Change-Id: I621ba8f8e119a9ab8ba5455b28a565e3cae2f7cd
Signed-off-by: Hareesh Gundu <hareeshg@codeaurora.org>
Signed-off-by: poondog <markj338@gmail.com>
PATCH: Linux 3.4.21

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PATCH: Linux 3.4.22

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PATCH: Linux 3.4.23

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PATCH: Linux 3.4.24

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PATCH: Linux 3.4.25

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PATCH: Linux 3.4.26

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PATCH: Linux 3.4.27

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PATCH: Linux 3.4.28

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PATCH: Linux 3.4.30

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PATCH: Linux 3.4.32

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PATCH: Linux 3.4.33

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PATCH: Linux 3.4.34

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PATCH: Linux 3.4.35

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PATCH: Linux 3.4.36

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PATCH: Linux 3.4.37

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PATCH: Linux 3.4.38

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PATCH: Linux 3.4.39

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PATCH: Linux 3.4.40

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