tools/thermal: tmon: silence 'set but not used' warnings

gcc complains about the 'cols' variable being unused. This is
unavoidable, given the ncurses getmaxyx() macro-based API, which wants
to assign to a variable directly, even when we're not going to use it.

Warning:

    gcc -O1 -Wall -Wshadow -W -Wformat -Wimplicit-function-declaration -Wimplicit-int -fstack-protector -D VERSION=\"1.0\"   -c -o tui.o tui.c
    tui.c: In function ‘show_dialogue’:
    tui.c:288:12: warning: variable ‘cols’ set but not used [-Wunused-but-set-variable]
      int rows, cols;
                ^

So, add a hack to get rid of that warning.
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>
Acked-by: NJacob Pan <jacob.jun.pan@linux.intel.com>
Reviewed-by: NFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: NZhang Rui <rui.zhang@intel.com>

tools/thermal/tmon/tui.c

@@ -293,6 +293,9 @@ void show_dialogue(void)
 
 	getmaxyx(w, rows, cols);
 
+	/* Silence compiler 'unused' warnings */
+	(void)cols;
+
 	werase(w);
 	box(w, 0, 0);
 	mvwprintw(w, 0, maxx/4, DIAG_TITLE);