Fix the calculation of the number of iterations.

--- src/libwps/libwps.c	2012-01-18 10:02:39.000000000 +0100
+++ src/libwps/libwps.c	2017-01-09 00:55:01.593948178 +0100
@@ -83,7 +83,7 @@
 
 	if(wps_ie_data)
 	{
-		for(i=0; i<sizeof(elements); i++)
+		for(i=0; i<sizeof(elements)/sizeof(elements[0]); i++)
 		{
 			/* Search for each WPS element inside the WPS IE data blob */
 			el = get_wps_data_element(wps_ie_data, wps_data_len, elements[i], &el_len);