tracing, function tracer: Clean up strstrip() usage

Clean up strstrip() usage - which also addresses this build warning:

  kernel/trace/ftrace.c: In function 'ftrace_pid_write':
  kernel/trace/ftrace.c:3004: warning: ignoring return value of 'strstrip', declared with attribute warn_unused_result

Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 4 insertions, 5 deletions

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 7f9b51e8184b..1dc101d09765 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -2985,7 +2985,7 @@ static ssize_t
 ftrace_pid_write(struct file *filp, const char __user *ubuf,
                    size_t cnt, loff_t *ppos)
 {
-        char buf[64];
+        char buf[64], *tmp;
         long val;
         int ret;
 
@@ -3001,11 +3001,11 @@ ftrace_pid_write(struct file *filp, const char __user *ubuf,
          * Allow "echo > set_ftrace_pid" or "echo -n '' > set_ftrace_pid"
          * to clean the filter quietly.
          */
-        strstrip(buf);
-        if (strlen(buf) == 0)
+        tmp = strstrip(buf);
+        if (strlen(tmp) == 0)
                 return 1;
 
-        ret = strict_strtol(buf, 10, &val);
+        ret = strict_strtol(tmp, 10, &val);
         if (ret < 0)
                 return ret;
 
@@ -3391,4 +3391,3 @@ void ftrace_graph_stop(void)
         ftrace_stop();
 }
 #endif
-