diff --git a/libusb/descriptor.c b/libusb/descriptor.c
index 74d6de5..0b0e314 100644
--- a/libusb/descriptor.c
+++ b/libusb/descriptor.c
@@ -1174,7 +1174,7 @@ int API_EXPORTED libusb_get_string_descriptor_ascii(libusb_device_handle *dev_ha
 		return LIBUSB_ERROR_IO;
 
 	if (tbuf[0] > r)
-		return LIBUSB_ERROR_IO;
+		tbuf[0] = r;
 
 	di = 0;
 	for (si = 2; si < tbuf[0]; si += 2) {
-- 
2.17.0

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<div class='path'>path: <a href='/guix/log/?id=4ce01773f3fe4c600785e38ba2e94033e66a72ef'>root</a>/<a href='/guix/log/tests?id=4ce01773f3fe4c600785e38ba2e94033e66a72ef'>tests</a>/<a href='/guix/log/tests/guix-daemon.sh?id=4ce01773f3fe4c600785e38ba2e94033e66a72ef'>guix-daemon.sh</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/tests/guix-daemon.sh?id=4ce01773f3fe4c600785e38ba2e94033e66a72ef&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2016-03-02 14:47:07 +0100'>2016-03-02</span></td><td><a href='/guix/commit/tests/guix-daemon.sh?id=442a6ff5eae094f1fd4e09241a2f35c33ab908da'>tests: Disable grafts by default.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes &lt;http://bugs.gnu.org/22872&gt;.
Reported by myglc2 &lt;myglc2@gmail.com&gt;.

* test-env.in: Define and export 'GUIX_BUILD_OPTIONS'.
* tests/guix-build.sh: When setting 'GUIX_BUILD_OPTIONS', make sure it
contains '--no-grafts'.
* tests/guix-package.sh: Likewise.
* tests/guix-daemon.sh: Add (%graft? #f) in Scheme snippets.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2015-09-28 22:54:04 +0200'>2015-09-28</span></td><td><a href='/guix/commit/tests/guix-daemon.sh?id=16748d80158875ae4cd54270be683fcf9c5d5169'>store: Add 'query-failed-paths' and 'clear-failed-paths' RPCs.</a><span class='msg-avail'>...<span class='msg-tooltip'>Suggested by Mark H Weaver &lt;mhw@netris.org&gt;.

* guix/store.scm (query-failed-paths, clear-failed-paths): New
  procedures.
* tests/guix-daemon.sh: Add test with daemon started with
  --cache-failures.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2015-07-13 18:29:01 +0200'>2015-07-13</span></td><td><a href='/guix/commit/tests/guix-daemon.sh?id=24f5aaaf24e009de7f7402f2d311a26cafbf4f4a'>substitute: Honor "substitute-urls" option passed by "untrusted" clients.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/scripts/substitute.scm (or*): New macro.
  (%cache-url): Honor "untrusted-substitute-urls".
* guix/tests.scm (%test-substitute-urls): New variable.
  (open-connection-for-tests): Use it.
* tests/derivations.scm ("derivation-prerequisites-to-build and substitutes",
  "derivation-prerequisites-to-build and substitutes, non-substitutable
  build", "derivation-prerequisites-to-build and substitutes, local build"):
  Pass it to 'set-build-options'.
* tests/guix-daemon.sh: Likewise.
* tests/store.scm ("substitute query, alternating URLs"): New test.
  ("substitute query", "substitute", "substitute + build-things with output
  path", "substitute, corrupt output hash", "substitute --fallback"): Pass
  #:substitute-urls to 'set-build-options'.
</span></span></td><td>Ludovic Courtès</td></tr>