[sqlite] FTS returns out of memory when use NEAR and OR

[Vlad Seryakov]

Hello

For some time already i noticed that when i use NEAR/1 and OR in one query like
SELECT * FROM search WHERE search MATCH 'tom NEAR/1 hanks or tom hanks'

i get out of memory error. Running this on 16Gb laptop cannot be memory issue 
and the database only has several thousands of records. Investigating the code 
i found one place where in fts3EvalNearTest where it happens:

line 129689 i version 3.7.14.1

    nTmp += p->pPhrase->doclist.nList;                         
    aTmp = sqlite3_malloc(nTmp*2);
    if( !aTmp ){                                                         

Adding the check before the malloc solved the problem
    if (nTmp <= 0) return res;

Thanks

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