fix for ARC and bug in date comparison

SQLClient.h

@@ -2256,7 +2256,8 @@ SQLCLIENT_PRIVATE
 /** Creates and returns a copy of aString as a literal,
  * whether or not aString is already a literal string.
  */
-extern SQLLiteral * SQLClientCopyLiteral(NSString *aString);
+extern SQLLiteral * SQLClientCopyLiteral(NSString *aString)
+  NS_RETURNS_RETAINED;
 
 /** Function to test an object to see if it is considered to be a literal
  * string by SQLClient.  Use this rather than trying to chewck the class
@@ -2277,7 +2278,8 @@ extern SQLLiteral * SQLClientMakeLiteral(NSString *aString);
  * from a UTF8 or ASCII C string whose length (not including any nul
  * terminator) is the specified count.
  */
-extern SQLLiteral * SQLClientNewLiteral(const char *bytes, unsigned count);
+extern SQLLiteral * SQLClientNewLiteral(const char *bytes, unsigned count)
+  NS_RETURNS_RETAINED;
 
 /** Creates and returns an autoreleased proxy to aString, recording the
  * fact that the programmer considers the string to be a valid literal

SQLClient.m

@@ -5398,15 +5398,6 @@ nextUTF8(const uint8_t *p, unsigned l, unsigned *o, unichar *n)
   return [super dataUsingEncoding: encoding allowLossyConversion: flag];
 }
 
-- (void) dealloc
-{
-  utf8Bytes = NULL;	// Break reference loops
-  byteLen = 0;
-  charLen = 0;
-  hasHash = NO;
-  DEALLOC
-}
-
 - (void) getCharacters: (unichar*)buffer
 		 range: (NSRange)aRange
 {

SQLClientPool.m

@@ -893,7 +893,7 @@ static Class      cls = Nil;
                */
               locked = [_lock tryLockWhenCondition: 1];
             }
-          else if ([when earlierDate: until] == until)
+          else if ([when earlierDate: until] != when)
             { 
               locked = [_lock lockWhenCondition: 1 beforeDate: until];
             }