Fix compiler warning in media/mtp.

BUG=27152673

Change-Id: I0a5a7f2005bd76acf4d09353305b66af3fd29e4b
diff --git a/media/mtp/MtpProperty.cpp b/media/mtp/MtpProperty.cpp
index d58e2a4..2be2d79 100644
--- a/media/mtp/MtpProperty.cpp
+++ b/media/mtp/MtpProperty.cpp
@@ -544,7 +544,7 @@
     MtpPropertyValue* result = new MtpPropertyValue[length];
     for (uint32_t i = 0; i < length; i++)
         if (!readValue(packet, result[i])) {
-            delete result;
+            delete [] result;
             return NULL;
         }
     return result;