Separate the lines received in a single read.

Fixes the case where multiple lines are read in a single read syscall
(it could be better optimized in the future). Also fixes a memory
corruption issue when rec == 0.

i3bar/src/main.c

@@ -249,7 +249,7 @@ int main(int argc, char **argv) {
 
     FREE(socket_path);
 
-    FREE(statusline);
+    FREE(statusline_buffer);
 
     clean_xcb();
     ev_default_destroy();