Remove duplicate mutex lock in `t_phone::end_call()`

A write lock on `lines_mtx` has already been acquired at the beginning
of `end_call()`.

1 files changed, 0 insertions, 2 deletions

diff --git a/src/phone.cpp b/src/phone.cpp
index 16abc38..8de3834 100644
--- a/src/phone.cpp
+++ b/src/phone.cpp
@@ -279,8 +279,6 @@ void t_phone::end_call(void) {
 			move_line_to_background(lineno1);
 			move_line_to_background(lineno2);
 		} else {
-			t_rwmutex_reader x(lines_mtx);
-
 			// Hangup the active line, and make the next
 			// line active.
 			int l = active_line;