Use SDL C runtime strlen()
diff --git a/src/audio/alsa/SDL_alsa_audio.c b/src/audio/alsa/SDL_alsa_audio.c
index f225b3b..3fdbd82 100644
--- a/src/audio/alsa/SDL_alsa_audio.c
+++ b/src/audio/alsa/SDL_alsa_audio.c
@@ -799,7 +799,7 @@ ALSA_HotplugThread(void *arg)
for (j = 0; prefixes[j]; j++) {
const char *prefix = prefixes[j];
- const size_t prefixlen = strlen(prefix);
+ const size_t prefixlen = SDL_strlen(prefix);
if (SDL_strncmp(name, prefix, prefixlen) == 0) {
if (j < bestmatch) {
bestmatch = j;