[obvious commited PATCH]: comment touch-ups in frame.c

[Jason Molenda <jmolenda at apple dot com>]

I had to read through frame.c today and saw a few small typeos and the 
like while reading it; corrected them as I went along.  I've checked in 
the patch at the end of the e-mail.

As an aside, in the struct frame_info decl, there's this comment:

  /* NOTE: cagney/2002-04-05: Perhaps a level of ``-1'' should be
     reserved to indicate a bogus frame - one that has been created
     just to keep GDB happy (GDB always needs a frame).  For the
     moment leave this as speculation.  */
  int level;

Of course level == -1 means the sentinel frame today, so I'm guessing 
this comment is out of date.  Oh, and one comment I didn't know how to 
fix was this one in frame_register():

  /* Ulgh!  Old code that, for lval_register, sets ADDRP to the offset
     of the register in the register cache.  It should instead return
     the REGNUM corresponding to that register.  Translate the .  */

I'm not exactly sure what the rest of this sentence was meant to be.

2004-04-16  Jason Molenda  (jmolenda@apple.com)

        * frame.c: Minor typeo corrections in comments.

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