tracing: Make tracing_open_generic_{tr,tc}() static

I have patches that will use tracing_open_generic_tr/tc() in other
files, but as they are not ready to be merged yet, and Fengguang Wu's
sparse scripts pointed out that these functions were not declared
anywhere, I'll make them static for now.

When these functions are required to be used elsewhere, I'll remove
the static then.
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

kernel/trace/trace.c

@@ -2960,7 +2960,7 @@ int tracing_open_generic(struct inode *inode, struct file *filp)
  * Open and update trace_array ref count.
  * Must have the current trace_array passed to it.
  */
-int tracing_open_generic_tr(struct inode *inode, struct file *filp)
+static int tracing_open_generic_tr(struct inode *inode, struct file *filp)
 {
 	struct trace_array *tr = inode->i_private;
 
@@ -2976,7 +2976,7 @@ int tracing_open_generic_tr(struct inode *inode, struct file *filp)
 	
 }
 
-int tracing_open_generic_tc(struct inode *inode, struct file *filp)
+static int tracing_open_generic_tc(struct inode *inode, struct file *filp)
 {
 	struct trace_cpu *tc = inode->i_private;
 	struct trace_array *tr = tc->tr;