Update print-esp.c
diff --git a/print-esp.c b/print-esp.c
index 6ba92ed..5208149 100644
--- a/print-esp.c
+++ b/print-esp.c
@@ -622,8 +622,8 @@
 	const u_char *ivoff;
 	const u_char *p;
 	EVP_CIPHER_CTX *ctx;
-        u_char *buf_mut, *output_buffer;
-        int block_size, cipher_nid, output_buffer_size;
+	u_char *buf_mut, *output_buffer;
+	int block_size, cipher_nid, output_buffer_size;
 #endif
 
 	esp = (const struct newesp *)bp;