selftests/ftrace: Handle the absence of tput

In environments where tput is not available, we get the following
error
$ ./ftracetest: 163: [: Illegal number:
because ncolors is an empty string. Fix that by setting it to 0 if the
tput command fails.

Acked-by: Steven Rostedt (VMware) <[e-mail]>
Acked-by: Masami Hiramatsu <[e-mail]>
Signed-off-by: Juerg Haefliger <[e-mail]>
Signed-off-by: Shuah Khan <[e-mail]>

tools/testing/selftests/ftrace/ftracetest

···
 
 # Define text colors
 # Check available colors on the terminal, if any
-ncolors=`tput colors 2>/dev/null`
+ncolors=`tput colors 2>/dev/null || echo 0`
 color_reset=
 color_red=
 color_green=
 color_blue=
 # If stdout exists and number of colors is eight or more, use them
-if [ -t 1 -a "$ncolors" -a "$ncolors" -ge 8 ]; then
+if [ -t 1 -a "$ncolors" -ge 8 ]; then
   color_reset="\033[0m"
   color_red="\033[31m"
   color_green="\033[32m"