[sqlite] Possible memory leaks in shell.c

[Ben Combee]

This one's in shell.c.  In process_input(), zLine is assigned using

 zLine = one_input_line(zSql, in);

Usually, you hit the free(zLine) call in one of the code paths before
repeating the while loop.  However, on line 1614

   if( (zSql==0 || zSql[0]==0) && _all_whitespace(zLine) ) continue;

you can continue to the top of the while loop without freeing zLine,
resulting in a leak when the next line of input is read.

It also looks like you can lose the memory attached to zLine if you
hit line 1609's if statement

     if( in!=0 ) break;

and break out of the while loop.

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