fix potential null pointer deref found by coverity #190
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CID 442541: (lurcher#2 of 2): Explicit null dereferenced (FORWARD_NULL) 7. var_deref_model: Passing null pointer buf to SQLGetPrivateProfileString, which dereferences it. [Note: The source code implementation of the function has been overridden by a builtin model.] CID 442541:(lurcher#1 of 2):Explicit null dereferenced (FORWARD_NULL) [ "select issue" ] 645 ret = SQLGetPrivateProfileString( sect, entry, def, buf, cbRetBuffer, name );
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CID 442541: (#2 of 2): Explicit null dereferenced (FORWARD_NULL)
7. var_deref_model: Passing null pointer buf to SQLGetPrivateProfileString, which dereferences it. [Note: The source code implementation of the function has been overridden by a builtin model.] CID 442541:(#1 of 2):Explicit null dereferenced (FORWARD_NULL) [ "select issue" ]
645 ret = SQLGetPrivateProfileString( sect, entry, def, buf, cbRetBuffer, name );