module_need: handle module loading error

(cherry picked from commit b9513f3c)

src/modules/modules.c

@@ -565,12 +565,15 @@ found_shortcut:
         {
             module_t *p_new_module =
                 AllocatePlugin( p_this, p_real->psz_filename );
-            if( p_new_module )
-            {
+            if( p_new_module == NULL )
+            {   /* Corrupted module */
+                msg_Err( p_this, "possibly corrupt module cache" );
+                module_release( p_cand );
+                continue;
+            }
             CacheMerge( p_this, p_real, p_new_module );
             DeleteModule( p_module_bank, p_new_module );
         }
-        }
 #endif
 
         p_this->b_force = p_list[i].b_force;