crypto: use local path for local headers

When pulling in headers that are in the same directory as the C file (as
opposed to one in include/), we should use its relative path, without a
directory.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Acked-by: Daniel P. Berrangé <berrange@redhat.com>
diff --git a/crypto/ivgen-plain64.c b/crypto/ivgen-plain64.c
index e4679a1..fbb7724 100644
--- a/crypto/ivgen-plain64.c
+++ b/crypto/ivgen-plain64.c
@@ -20,7 +20,7 @@
 
 #include "qemu/osdep.h"
 #include "qemu/bswap.h"
-#include "crypto/ivgen-plain.h"
+#include "ivgen-plain.h"
 
 static int qcrypto_ivgen_plain_init(QCryptoIVGen *ivgen,
                                     const uint8_t *key, size_t nkey,