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>

libfdt/fdt_ro.c

@@ -166,7 +166,7 @@ int fdt_path_offset(const void *fdt, const char *path)
 		p = q;
 	}
 
-	return offset;	
+	return offset;
 }
 
 const char *fdt_get_name(const void *fdt, int nodeoffset, int *len)
@@ -244,7 +244,7 @@ const struct fdt_property *fdt_get_property(const void *fdt,
 
 				if (lenp)
 					*lenp = len;
-				
+
 				return prop;
 			}
 			break;