selftests/ftrace: Allow ":" in description

Allow ":" in the description line. Currently if there is ":"
in the test description line, the description is cut at that
point, but that was unintended.
Signed-off-by: NMasami Hiramatsu <mhiramat@kernel.org>
Reviewed-by: NTom Zanussi <zanussi@kernel.org>
Signed-off-by: NShuah Khan <skhan@linuxfoundation.org>

tools/testing/selftests/ftrace/ftracetest

@@ -263,7 +263,7 @@ CASENO=0
 
 testcase() { # testfile
   CASENO=$((CASENO+1))
-  desc=`grep "^#[ \t]*description:" $1 | cut -f2 -d:`
+  desc=`grep "^#[ \t]*description:" $1 | cut -f2- -d:`
   prlog -n "[$CASENO]$INSTANCE$desc"
 }