tracing: Put trace_puts() comment above trace_puts() macro for kernel doc

Kernel-doc gives the following warning:

  DOCPROC Documentation/DocBook/kernel-api.xml
Warning(/include/linux/kernel.h:590): No description found for parameter 'ip'
Warning(/include/linux/kernel.h:590): No description found for parameter 'ip'

Due to the externs between the the comment and the trace_puts() macro.
This is fixed by moving the externs below the macro and keeping the
macro and comment directly together.
Reported-by: Robert P. J. Day <rpjday@crashcourse.ca>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

include/linux/kernel.h

@@ -562,9 +562,6 @@ int __trace_bprintk(unsigned long ip, const char *fmt, ...);
 extern __printf(2, 3)
 int __trace_printk(unsigned long ip, const char *fmt, ...);
 
-extern int __trace_bputs(unsigned long ip, const char *str);
-extern int __trace_puts(unsigned long ip, const char *str, int size);
-
 /**
  * trace_puts - write a string into the ftrace buffer
  * @str: the string to record
@@ -600,6 +597,8 @@ extern int __trace_puts(unsigned long ip, const char *str, int size);
 	else								\
 		__trace_puts(_THIS_IP_, str, strlen(str));		\
 })
+extern int __trace_bputs(unsigned long ip, const char *str);
+extern int __trace_puts(unsigned long ip, const char *str, int size);
 
 extern void trace_dump_stack(int skip);