dtc: Whitespace cleanup

This large patch removes all trailing whitespace from dtc (including
libfdt, the testsuite and documentation).  It also removes a handful
of redundant blank lines (at the end of functions, or when there are
two blank lines together for no particular reason).

As well as anything else, this means that quilt won't whinge when I go
to convert the whole of libfdt into a patch to apply to the kernel.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

tests/testutils.c

@@ -104,7 +104,6 @@ void check_property(void *fdt, int nodeoffset, const char *name,
 		     name, proplen, len);
 	if (memcmp(val, prop->data, len) != 0)
 		FAIL("Data mismatch on property \"%s\"", name);
-	
 }
 
 const void *check_getprop(void *fdt, int nodeoffset, const char *name,