qsf: Better handling of Page A2h netlink read failure

Print "Failed to read Page A2h." error message to provide more context
for "netlink error: (...)" info.

Signed-off-by: Krzysztof Piotr Oledzki <ole@ans.pl>

sfpid.c

diff --git a/sfpid.c b/sfpid.c
index 1bc45c1..d9bda70 100644
--- a/sfpid.c
+++ b/sfpid.c
@@ -494,8 +494,10 @@
 	/* Read A2h page */
 	ret = sff8079_get_eeprom_page(ctx, SFF8079_I2C_ADDRESS_HIGH,
 				      buf + ETH_MODULE_SFF_8079_LEN);
-	if (ret)
+	if (ret) {
+		fprintf(stderr, "Failed to read Page A2h.\n");
 		goto out;
+	}
 
 	sff8472_show_all(buf);
 out: