M3UParser: trim spaces when parsing comma separated codecs.

Bug: 13402087
Change-Id: Idc92716bfefd6d1b0cb371d0d97d990d53288090
diff --git a/media/libstagefright/httplive/M3UParser.cpp b/media/libstagefright/httplive/M3UParser.cpp
index 587a6d5..87918c8 100644
--- a/media/libstagefright/httplive/M3UParser.cpp
+++ b/media/libstagefright/httplive/M3UParser.cpp
@@ -365,6 +365,7 @@
             codecs.append(',');
             while ((commaPos = codecs.find(",", offset)) >= 0) {
                 AString codec(codecs, offset, commaPos - offset);
+                codec.trim();
                 // return true only if a codec of type `key` ("audio"/"video")
                 // is found.
                 if (codecIsType(codec, key)) {