binfmt_misc: Make debug printed using pr_debug()
binfmt_misc: Make debug printed using pr_debug()

It's a debug message, and it shouldn't be printed with
pr_perror(). Also, we interested in debug in the both
cases: magic and extensions.

Signed-off-by: Kirill Tkhai <e5b39230c99b4d3ebd6aa54f6d823f95134bc39d@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@virtuozzo.com>

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