[Ada] Fix minor warning issue

[Eric Botcazou]

Tested on x86_64-suse-linux, applied on the mainline, 9 and 8 branches.


2019-05-27  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/utils.c (maybe_pad_type): Issue the warning for the
	specific case of component types preferably.

-- 
Eric Botcazou
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