[Crash-utility] [PATCH 7/11] Cleanup handling of flags in cmd_datatype_common()

[Petr Tesarik]

This patch improves handling of struct/union flags:

1. You can now specify a typedef with "*". Previously it failed like
   this:

crash> *acct_t ffff8800982ad520
*: invalid argument
 
2. Report an error if a non-structured type is used, instead of
   giving no output, e.g.:

crash> *pid_t
*: invalid argument
 
3. Produce an error message if the type does not match the command:
 
crash> union page
union: data type mismatch: page is not a union
crash> struct thread_union
struct: data type mismatch: thread_union is not a struct
 
Additionaly, these checks are now performed early, that is before
entering the main printing loop.
        
Signed-off-by: Petr Tesarik <ptesarik at suse.cz>
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