gdb: remove stale comment in value_assign

This comment is no longer relevant, put_frame_register_bytes now accepts
the "next frame".

Change-Id: I077933a03f8bdb886f8ba10a98d1202a38bce0a9
Approved-By: Tom Tromey <tom@tromey.com>
diff --git a/gdb/valops.c b/gdb/valops.c
index 21b0106..049314c 100644
--- a/gdb/valops.c
+++ b/gdb/valops.c
@@ -1193,13 +1193,6 @@ value_assign (struct value *toval, struct value *fromval)
 
     case lval_register:
       {
-	/* Figure out which frame this register value is in.  The value
-	   holds the frame_id for the next frame, that is the frame this
-	   register value was unwound from.
-
-	   Below we will call put_frame_register_bytes which requires that
-	   we pass it the actual frame in which the register value is
-	   valid, i.e. not the next frame.  */
 	frame_info_ptr next_frame = frame_find_by_id (VALUE_NEXT_FRAME_ID (toval));
 
 	int value_reg = VALUE_REGNUM (toval);