Delete memory allocated by GetStreamCaps

Bug: webrtc:13260
Change-Id: I18c23e2c3aad7c711c33c8cc381d46275473b4a0
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/237344
Reviewed-by: Per Kjellander <perkj@webrtc.org>
Commit-Queue: Sergey Silkin <ssilkin@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#35369}
diff --git a/modules/video_capture/windows/device_info_ds.cc b/modules/video_capture/windows/device_info_ds.cc
index 455501f..fb8d551 100644
--- a/modules/video_capture/windows/device_info_ds.cc
+++ b/modules/video_capture/windows/device_info_ds.cc
@@ -389,6 +389,9 @@
         RTC_LOG(LS_INFO) << "Device support FORMAT_VideoInfo2";
         supportFORMAT_VideoInfo = true;
       }
+
+      FreeMediaType(pmt);
+      pmt = NULL;
     }
   }
   if (supportFORMAT_VideoInfo2) {