[PATCH v2] trace/ftrace: fix maybe-uninitialized compiler warning

[Kaitao Cheng]

During build compiler reports some 'false positive' warnings about
variables {'seq_ops', 'filtered_pids', 'other_pids'} may be used
uninitialized. This patch silences these warnings.
Also delete some useless spaces

Signed-off-by: Kaitao Cheng <pilgrim...@gmail.com>
---
 kernel/trace/ftrace.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 7d0ebd104706..b4a458990ad0 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -2260,7 +2260,7 @@ ftrace_find_tramp_ops_next(struct dyn_ftrace *rec,
 
                if (hash_contains_ip(ip, op->func_hash))
                        return op;
-       } 
+       }
 
        return NULL;
 }
@@ -3599,7 +3599,7 @@ static int t_show(struct seq_file *m, void *v)
                        if (direct)
                                seq_printf(m, "\n\tdirect-->%pS", (void 
*)direct);
                }
-       }       
+       }
 
        seq_putc(m, '\n');
 
@@ -7151,6 +7151,10 @@ static int pid_open(struct inode *inode, struct file 
*file, int type)
        case TRACE_NO_PIDS:
                seq_ops = &ftrace_no_pid_sops;
                break;
+       default:
+               trace_array_put(tr);
+               WARN_ON_ONCE(1);
+               return -EINVAL;
        }
 
        ret = seq_open(file, seq_ops);
@@ -7229,6 +7233,10 @@ pid_write(struct file *filp, const char __user *ubuf,
                other_pids = rcu_dereference_protected(tr->function_pids,
                                             lockdep_is_held(&ftrace_lock));
                break;
+       default:
+               ret = -EINVAL;
+               WARN_ON_ONCE(1);
+               goto out;
        }
 
        ret = trace_pid_write(filtered_pids, &pid_list, ubuf, cnt);
-- 
2.20.1