mm: docs: Fix a comment in process_vm_rw_core

This removes a duplicate "a" in the comment in process_vm_rw_core.
Signed-off-by: Bernd Edlinger <bernd.edlinger@hotmail.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>

mm/process_vm_access.c

@@ -206,7 +206,7 @@ static ssize_t process_vm_rw_core(pid_t pid, struct iov_iter *iter,
 	if (!mm || IS_ERR(mm)) {
 		rc = IS_ERR(mm) ? PTR_ERR(mm) : -ESRCH;
 		/*
-		 * Explicitly map EACCES to EPERM as EPERM is a more a
+		 * Explicitly map EACCES to EPERM as EPERM is a more
 		 * appropriate error code for process_vw_readv/writev
 		 */
 		if (rc == -EACCES)