Cleanup SQLite 3.6.18 import.

third_party/sqlite/src/ext/fts1/fts1.c

Index: third_party/sqlite/src/ext/fts1/fts1.c
diff --git a/third_party/sqlite/src/ext/fts1/fts1.c b/third_party/sqlite/src/ext/fts1/fts1.c
index d5d00b94f115b0f3792feacf31352934b3a98245..d5429ff320a9b7ebebcd6d2f18f3c9e3360735f7 100644
--- a/third_party/sqlite/src/ext/fts1/fts1.c
+++ b/third_party/sqlite/src/ext/fts1/fts1.c
@@ -208,7 +208,7 @@ static int safe_isspace(char c){
   return (c&0x80)==0 ? isspace(c) : 0;
 }
 static int safe_tolower(char c){
-  return (c>='A' && c<='Z') ? (c-'A'+'a') : c;
+  return (c&0x80)==0 ? tolower(c) : c;
 }
 static int safe_isalnum(char c){
   return (c&0x80)==0 ? isalnum(c) : 0;
@@ -1225,6 +1225,10 @@ static int sql_step_statement(fulltext_vtab *v, fulltext_statement iStmt,
     break;
   }
   return rc;
+
+ err:
+  sqlite3_finalize(s);
+  return rc;
 }
 
 /* Like sql_step_statement(), but convert SQLITE_DONE to SQLITE_OK.