Fix warning for redundant typedef

frameworks/base/media/libmedia/autodetect.cpp:22: warning: 'typedef' was ignored in this declaration

Change-Id: I8c7404b9f5aa515c0fe92a5a46f24248d6fe96bf
diff --git a/media/libmedia/autodetect.cpp b/media/libmedia/autodetect.cpp
index dfcc6a0..be5c3b2 100644
--- a/media/libmedia/autodetect.cpp
+++ b/media/libmedia/autodetect.cpp
@@ -16,7 +16,7 @@
 
 #include "autodetect.h"
 
-typedef struct CharRange {
+struct CharRange {
     uint16_t first;
     uint16_t last;
 };