net: constify MIB name tables

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/snmp.h b/include/net/snmp.h
index f0d756f..da02ee0 100644
--- a/include/net/snmp.h
+++ b/include/net/snmp.h
@@ -32,7 +32,7 @@
  *  - name of entries.
  */
 struct snmp_mib {
-	char *name;
+	const char *name;
 	int entry;
 };