tracing: Use outer () on __get_str() definition

__get_str(str)'s definition includes a (char *) operator
overloading that is not protected with outer ().

This patch adds () around __get_str()'s definition, enabling
some code cleanup.

Link: http://lkml.kernel.org/r/[e-mail]

Cc: Trond Myklebust <[e-mail]>
Cc: Anna Schumaker <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Suggested-by: Steven Rostedt <[e-mail]>
Reviewed-by: Steven Rostedt <[e-mail]>
Signed-off-by: Daniel Bristot de Oliveira <[e-mail]>
Signed-off-by: Steven Rostedt <[e-mail]>

include/trace/perf.h

···
 		((__entry->__data_loc_##field >> 16) & 0xffff)
 
 #undef __get_str
-#define __get_str(field) (char *)__get_dynamic_array(field)
+#define __get_str(field) ((char *)__get_dynamic_array(field))
 
 #undef __get_bitmask
 #define __get_bitmask(field) (char *)__get_dynamic_array(field)

include/trace/trace_events.h

···
 		((__entry->__data_loc_##field >> 16) & 0xffff)
 
 #undef __get_str
-#define __get_str(field) (char *)__get_dynamic_array(field)
+#define __get_str(field) ((char *)__get_dynamic_array(field))
 
 #undef __get_bitmask
 #define __get_bitmask(field)						\