plugins/old-stats: Remove restrict_access_set_dumpable calls from pro…

…cess_io_open().

proc_io_fd is opened in preinit(), while process have root access, so
restrict_access_set_dumpable() calls are not needed.

src/plugins/old-stats/mail-stats-fill.c

@@ -2,7 +2,6 @@
 
 #include "lib.h"
 #include "time-util.h"
-#include "restrict-access.h"
 #include "stats-plugin.h"
 #include "mail-stats.h"
 
@@ -47,9 +46,6 @@ static int process_io_open(void)
 	if (proc_io_disabled)
 		return -1;
 
-	bool dumpable = restrict_access_get_dumpable();
-	if (!dumpable)
-		restrict_access_set_dumpable(TRUE);
 	proc_io_fd = open(PROC_IO_PATH, O_RDONLY);
 	if (proc_io_fd == -1 && errno == EACCES) {
 		/* kludge: if we're running with permissions temporarily
@@ -65,8 +61,6 @@ static int process_io_open(void)
 		}
 		errno = EACCES;
 	}
-	if (!dumpable)
-		restrict_access_set_dumpable(FALSE);
 	if (proc_io_fd == -1) {
 		/* ignore access errors too, certain security options can
 		   prevent root access to this file when not owned by root */