EXT-2215 - Viewer crashes while trying to decode image

llwarns is not entirely thread safe. Need to fix that, but for now, use LL_DEBUGS instead.

indra/llimagej2coj/llimagej2coj.cpp

@@ -168,7 +168,7 @@ BOOL LLImageJ2COJ::decodeImpl(LLImageJ2C &base, LLImageRaw &raw_image, F32 decod
 	// dereference the array.
 	if(!image || !image->numcomps)
 	{
-		llwarns << "ERROR -> decodeImpl: failed to decode image!" << llendl;
+		LL_DEBUGS("Texture") << "ERROR -> decodeImpl: failed to decode image!" << LL_ENDL;
 		if (image)
 		{
 			opj_image_destroy(image);
@@ -241,7 +241,7 @@ BOOL LLImageJ2COJ::decodeImpl(LLImageJ2C &base, LLImageRaw &raw_image, F32 decod
 		}
 		else // Some rare OpenJPEG versions have this bug.
 		{
-			llwarns << "ERROR -> decodeImpl: failed to decode image! (NULL comp data - OpenJPEG bug)" << llendl;
+			LL_DEBUGS("Texture") << "ERROR -> decodeImpl: failed to decode image! (NULL comp data - OpenJPEG bug)" << LL_ENDL;
 			opj_image_destroy(image);
 
 			return TRUE; // done
@@ -375,7 +375,7 @@ BOOL LLImageJ2COJ::encodeImpl(LLImageJ2C &base, const LLImageRaw &raw_image, con
 	if (!bSuccess)
 	{
 		opj_cio_close(cio);
-		llinfos << "Failed to encode image." << llendl;
+		LL_DEBUGS("Texture") << "Failed to encode image." << LL_ENDL;
 		return FALSE;
 	}
 	codestream_length = cio_tell(cio);