nxcomp: Add __attribute__((noreturn)) to more functions where appropriate.

nxcomp/src/Channel.h

@@ -519,7 +519,7 @@ class Channel
   // Set up the split stores.
   //
 
-  void handleSplitStoreError(int resource);
+  void handleSplitStoreError(int resource) __attribute__((noreturn));
 
   void handleSplitStoreAlloc(List *list, int resource);
   void handleSplitStoreRemove(List *list, int resource);

nxcomp/src/Jpeg.cpp

@@ -106,7 +106,7 @@ static int DecompressJpeg24(unsigned char *compressedData, int compressedLen,
 static int DecompressJpeg32(unsigned char *compressedData, int compressedLen,
                                 unsigned int w, unsigned int h, unsigned char *dstBuf, int byteOrder);
 
-void UnpackJpegErrorHandler(j_common_ptr cinfo);
+void UnpackJpegErrorHandler(j_common_ptr cinfo) __attribute__((noreturn));
 
 //
 // Colormap stuff.

nxcomp/src/Transport.h

@@ -413,9 +413,9 @@ class AgentTransport : public Transport
   // These two should never be called.
   //
 
-  virtual int flush();
+  virtual int flush() __attribute__((noreturn));
 
-  virtual int drain(int limit, int timeout);
+  virtual int drain(int limit, int timeout) __attribute((noreturn));
 
   //
   // Same as in the base class.