platform/x86: hp-bioscfg: Skip empty attribute names

Avoid registering kobjects with empty names when a BIOS attribute
name decodes to an empty string.

Fixes: a34fc329b1895 ("platform/x86: hp-bioscfg: bioscfg")
Reported-by: Alain Cousinie <[e-mail]>
Closes: https://lore.kernel.org/platform-driver-x86/[e-mail]/
Signed-off-by: Mario Limonciello <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Reviewed-by: Ilpo Järvinen <[e-mail]>
Signed-off-by: Ilpo Järvinen <[e-mail]>

drivers/platform/x86/hp/hp-bioscfg/bioscfg.c

···
 		return ret;
 	}
 
+	if (!str_value || !str_value[0]) {
+		pr_debug("Ignoring attribute with empty name\n");
+		goto pack_attr_exit;
+	}
+
 	/* All duplicate attributes found are ignored */
 	duplicate = kset_find_obj(temp_kset, str_value);
 	if (duplicate) {