fix potential null pointer deref found by coverity #188
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CID 442487: (lurcher#1 of 1): Explicit null dereferenced (FORWARD_NULL) 5. var_deref_model: Passing null pointer pout to SQLInstallDriverEx, which dereferences it. [Note: The source code implementation of the function has been overridden by a builtin model.] 251 ret = SQLInstallDriverEx( drv, pth, pout, cbPathOutMax, &len, fRequest, lpdwUsageCount );
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CID 442487: (#1 of 1): Explicit null dereferenced (FORWARD_NULL)
5. var_deref_model: Passing null pointer pout to SQLInstallDriverEx, which dereferences it. [Note: The source code implementation of the function has been overridden by a builtin model.]
251 ret = SQLInstallDriverEx( drv, pth, pout, cbPathOutMax, &len, fRequest, lpdwUsageCount );