Fixed minor warnings in some OSC code

modules/juce_osc/osc/juce_OSCReceiver.cpp

@@ -114,14 +114,14 @@ namespace
             if (input.getNumBytesRemaining() < 4)
                 throw OSCFormatError ("OSC input stream exhausted while reading blob");
 
-            const size_t blobDataSize = input.readIntBigEndian();
+            const size_t blobDataSize = (size_t) input.readIntBigEndian();
 
-            if (input.getNumBytesRemaining() < (blobDataSize + 3) % 4)
+            if ((size_t) input.getNumBytesRemaining() < (blobDataSize + 3) % 4)
                 throw OSCFormatError ("OSC input stream exhausted before reaching end of blob");
 
             MemoryBlock blob;
 
-            const size_t bytesRead = input.readIntoMemoryBlock (blob, blobDataSize);
+            const size_t bytesRead = input.readIntoMemoryBlock (blob, (ssize_t) blobDataSize);
             readPaddingZeros (bytesRead);
 
             return blob;