MdeModulePkg/NvmExpress: Fix mem leak in error handling of Start()
MdeModulePkg/NvmExpress: Fix mem leak in error handling of Start()

Memory pointed to by Private->ControllerData has not been freed up
correctly at error handling path.

Cc: Simon (Xiang) Lian-SSI <c1fdfd54bd1c8a509f262906751804b20cd867f4@ssi.samsung.com>
Cc: Star Zeng <5c6bb72efe464613af94e84c05522a361b23844a@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Feng Tian <e66bb7e9f36c82a029035c5885acf75500d07e68@intel.com>
Reviewed-by: Star Zeng <5c6bb72efe464613af94e84c05522a361b23844a@intel.com>
Reviewed-by: Simon (Xiang) Lian-SSI <c1fdfd54bd1c8a509f262906751804b20cd867f4@ssi.samsung.com>

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