[GFS2] Remove unused GL_DUMP flag

There is no way to set the GL_DUMP flag, and in any case the
same thing can be done with systemtap if required for debugging,
so this removes it.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

fs/gfs2/glock.c

@@ -1244,9 +1244,6 @@ restart:
 
 	clear_bit(GLF_PREFETCH, &gl->gl_flags);
 
-	if (error == GLR_TRYFAILED && (gh->gh_flags & GL_DUMP))
-		dump_glock(gl);
-
 	return error;
 }
 

fs/gfs2/glock.h

@@ -28,7 +28,6 @@
 #define GL_NOCACHE		0x00000400
 #define GL_NOCANCEL		0x00001000
 #define GL_AOP			0x00004000
-#define GL_DUMP			0x00008000
 
 #define GLR_TRYFAILED		13
 #define GLR_CANCELED		14