Need bigger log buffer to avoid message truncation

The help message of CRIU has grown in size and is truncated because the
size of the private buffer in log.c is too small.  This patch increases
the size of the buffer.

[ The "bad" message is the --help output one ]
Signed-off-by: Saied Kazemi <saied@google.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

log.c

@@ -25,7 +25,7 @@
 
 static unsigned int current_loglevel = DEFAULT_LOGLEVEL;
 
-static char buffer[PAGE_SIZE];
+static char buffer[PAGE_SIZE * 2];
 static char buf_off = 0;
 
 static struct timeval start;
@@ -123,7 +123,7 @@ int log_init_by_pid(void)
 	reset_buf_off();
 
 	if (!opts.log_file_per_pid) {
-		buf_off += snprintf(buffer + buf_off, PAGE_SIZE - buf_off, "%6d: ", getpid());
+		buf_off += snprintf(buffer + buf_off, sizeof buffer - buf_off, "%6d: ", getpid());
 		return 0;
 	}
 
@@ -169,7 +169,7 @@ static void __print_on_level(unsigned int loglevel, const char *format, va_list
 			print_ts();
 	}
 
-	size  = vsnprintf(buffer + buf_off, PAGE_SIZE - buf_off, format, params);
+	size  = vsnprintf(buffer + buf_off, sizeof buffer - buf_off, format, params);
 	size += buf_off;
 
 	while (off < size) {