Tools: Fix struct size assert logic in struct_pack

The output struct can be padded upto a certain `size` and cannot exceed
it.

Signed-off-by: Mudit Sharma <mudit.sharma@arm.com>
Change-Id: I4dc4f734bf76df16171a8ce0b0723b0346f6e81f

Author: muditsharmaa-arm

tools/modules/struct_pack.py

@@ -18,6 +18,6 @@ def struct_pack(objects, pad_to=0):
     size = struct.calcsize(defstring)
     if size < pad_to:
         defstring += str(pad_to - size) + "x"
-    assert size < pad_to or pad_to == 0, "Error padding struct of size {} to {}".format(size, pad_to)
+    assert size <= pad_to or pad_to == 0, "Error padding struct of size {} to {}".format(size, pad_to)
 
     return (bytes(struct.pack(defstring, *objects)))