recv_image: do not include error.h

recv_image does not use anything from it and it is not available with all
C libraries, e.g. musl.

Signed-off-by: Jörg Krause <joerg.krause@embedded.rocks>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
diff --git a/recv_image.c b/recv_image.c
index 26a8361..0093831 100644
--- a/recv_image.c
+++ b/recv_image.c
@@ -4,7 +4,6 @@
 #define _BSD_SOURCE	/* struct ip_mreq */
 
 #include <errno.h>
-#include <error.h>
 #include <stdio.h>
 #include <netdb.h>
 #include <stdlib.h>