[PATCH for-4.15 1/2] tools/xenstore: Consolidate PRINTF_ATTRIBUTE() in utils.h

[Ian Jackson <iwj@xxxxxxxxxxxxxx>]

Julien Grall writes ("[PATCH for-4.15 1/2] tools/xenstore: Consolidate 
PRINTF_ATTRIBUTE() in utils.h"):
> From: Julien Grall <jgrall@xxxxxxxxxx>
> 
> At the moment PRINTF_ATTRIBUTE() is defined in two places:
>     - tdb.h: Defined as a NOP
>     - talloc.h: Defined as a NOP for GCC older than 3.0 otherwise will
>     add the attribute to check the printf format
> 
> Xen requires to build with minimum GCC 4.1 and we want to check the
> printf format for all the printf-like functions.
> 
> Only implement PRINTF_ATTRIBUTE() once in utils.h and drop the
> conditional check for GCC < 3.0.

Release-Acked-by: Ian Jackson <iwj@xxxxxxxxxxxxxx>