src: Fix terminal resize event processing

The fix ensures each complete line in the control buffer
is processed exactly once by passing the correct line
start position to the processing function and properly
null-terminating each line.

Signed-off-by: Sohan Kunkerkar <sohank2602@gmail.com>

Author: sohankunkerkar

src/ctrl.c

@@ -187,7 +187,7 @@ static gboolean read_from_ctrl_buffer(int fd, gboolean (*line_process_func)(char
 	char *newline = strchrnul(beg, '\n');
 	/* Process each message which ends with a line */
 	while (*newline != '\0') {
-		if (!line_process_func(ctlbuf))
+		if (!line_process_func(beg))
 			return G_SOURCE_CONTINUE;
 
 		beg = newline + 1;