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>
(cherry picked from commit 0bf84e4d516c4488e5fcf4b10e3a7263c13019e1)
patch_name: 0007-core-fix-build-warning-on-newer-versions-of-gcc.patch
present_in_specfile: true
location_in_specfile: 7
squash_commits: true