checkpatch: make extern in .h prototypes quieter
The use of extern in .h files is a bit contentious. Make the warning be emitted only when --strict is used on the command line. Signed-off-by: NJoe Perches <joe@perches.com> Cc: David Howells <dhowells@redhat.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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