commit 0bf84e4d516c4488e5fcf4b10e3a7263c13019e1
author Greg Kroah-Hartman <gregkh@linuxfoundation.org> Fri Jan 10 20:04:52 2020 +0100
committer Chris Dickens <christopher.a.dickens@gmail.com> Mon Jan 13 11:24:27 2020 -0800
tree 61853e00cdae21c4599f01b06af428bbba18d712
parent a36862b192fe25f621d1559a3b3490888f34a585

core: fix build warning on newer versions of gcc

When building libusb on a "newer" version of gcc (9.2), a lot of
warnings are thrown about zero-length messages as being part of a format
string.

An example of this is:

descriptor.c:546:11: warning: zero-length gnu_printf format string [-Wformat-zero-length]
  546 |  usbi_dbg("");
      |           ^~

Fix this up by replacing all calls of:
	usbi_dbg("");
with
	usbi_dbg(" ");
as obviously we still want to keep the implicit tracing message in the
log.

Closes #674

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Chris Dickens <christopher.a.dickens@gmail.com>