fix potential null pointer dereference found by coverity #187
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CID 442478: (#undefined of undefined): Explicit null dereferenced (FORWARD_NULL) 6. var_deref_model: Passing null pointer app to SQLWriteFileDSN, which dereferences it.[show details] 119 ret = SQLWriteFileDSN( file, app, key, str );
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CID 442478: (#undefined of undefined): Explicit null dereferenced (FORWARD_NULL)
6. var_deref_model: Passing null pointer app to SQLWriteFileDSN, which dereferences it.[show details]
119 ret = SQLWriteFileDSN( file, app, key, str );