MINOR: applet: Use unsafe version to get stream from SC in the trace function

When a trace message for an applet is dumped, if the SC exists, the stream
always exists too. There is no way to attached an applet to a health-check.
So, we can use the unsafe version __sc_strm() to get the stream.

This patch is related to #2106. Not sure it will be enough for
Coverity. However, there is no bug here.
1 file changed