pg: fix compilation

vlib/orm/orm_test.v

@@ -12,7 +12,7 @@ fn test_orm() {
 	db := pg.connect(
 		dbname:'vpm'
 		user:'alex'
-	)
+	) or { panic(err) }
 /*
 	//nr_modules := db.select count from modules
 	//nr_modules := db.select count from Modules where id == 1

vlib/pg/pg.v

@@ -128,7 +128,8 @@ pub fn (db DB) exec_one(query string) ?Row {
 // free. This prevents warnings and doesn't seem to affect behavior.
 pub fn (db DB) exec_param_many(query string, params []string) []Row {
 	unsafe {
-		mut param_vals := &byteptr( malloc( params.len * sizeof(byteptr) ) )
+		b := sizeof(byteptr)
+		mut param_vals := &byteptr(malloc(params.len * 8))
 		for i in 0..params.len {
 			param_vals[i] = params[i].str
 		}