Memory leak when using WantExpandedSQL

[gwenn]

go-sqlite3/sqlite3_trace.go

Line 91 in 25ecb14

expSQLiteCStr := C.sqlite3_expanded_sql((*C.sqlite3_stmt)(pStmt))

http://sqlite.org/c3ref/expanded_sql.html

The string returned by sqlite3_expanded_sql(P), on the other hand, is obtained from sqlite3_malloc() and must be free by the application by passing it to sqlite3_free().

[gjrtimmer]

@gwenn Thanks for pointing out, fix available in branch fix-733 could you please test and verify.

Thanks in advance.