Avoid a type mismatch that shows up in C++11.
Taken from <https://bugs.debian.org/853560>.

--- a/src/rtphint.cpp	2012-05-20 16:11:53.000000000 -0600
+++ b/src/rtphint.cpp	2017-05-16 10:25:26.930705191 -0600
@@ -339,7 +339,7 @@
                 pSlash = strchr(pSlash, '/');
                 if (pSlash != NULL) {
                     pSlash++;
-                    if (pSlash != '\0') {
+                    if (*pSlash != '\0') {
                         length = (uint32_t)strlen(pRtpMap) - (pSlash - pRtpMap);
                         *ppEncodingParams = (char *)MP4Calloc(length + 1);
                         strncpy(*ppEncodingParams, pSlash, length);
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<tr><td><span title='2023-08-06 02:00:00 +0200'>2023-08-06</span></td><td><a href='/guix/commit/gnu/packages/xml.scm?id=0318188a5c01ac85df37895c780658ed88dde581'>gnu: libxmlb: Update to 0.3.12.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/xml.scm (libxmlb): Update to 0.3.12.
[propagated-inputs]: Add zstd:lib.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2023-08-13 15:50:49 +0200'>2023-08-13</span></td><td><a href='/guix/commit/gnu/packages/xml.scm?id=bc6d1b4a417f87cd52a53dd22dd0ff18afc5a9b5'>gnu: freexl: Update to 2.0.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/xml.scm (freexl): Update to 2.0.0.
  [inputs]: Add expat and minizip.

Signed-off-by: Guillaume Le Vaillant &lt;glv@posteo.net&gt;
</span></span></td><td>Felix Gruber</td></tr>
<tr><td><span title='2023-07-09 10:43:02 +0300'>2023-07-09</span></td><td><a href='/guix/commit/gnu/packages/xml.scm?id=533d2b83a1c654369cbd7be1b9bf065c0b6c76a5'>gnu: libxml2: Download using mirror uri.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/xml.scm (libxml2)[source]: Rewrite source uri to use
download mirrors.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2023-07-09 10:43:02 +0300'>2023-07-09</span></td><td><a href='/guix/commit/gnu/packages/xml.scm?id=8c759ce23ef70f437d31011facb380a5eda1e09e'>gnu: libxslt: Download using mirror uri.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/xml.scm (libxslt)[source]: Rewrite source uri to use
download mirrors.
</span></span></td><td>Efraim Flashner</td></tr>