WINDOW: use mpv_observe_property for deprecated MPV_EVENTs

src/base/reg.c

@@ -22,7 +22,9 @@ reg_global(struct module_reg **reg_ptr)
 PRIVATE_FUNCTION void *
 reg_internal_get(struct module_reg *reg, const char *name)
 {
-    for (int i = 0; (reg + i) && (reg + i)->name && (reg + i)->obj; ++i) {
+    if (reg == NULL)
+        return NULL;
+    for (int i = 0; (reg + i)->name && (reg + i)->obj; ++i) {
         if (STR_MATCH((reg + i)->name, name))
             return (reg + i)->obj;
     }
@@ -32,7 +34,9 @@ reg_internal_get(struct module_reg *reg, const char *name)
 PRIVATE_FUNCTION reg_func
 reg_internal_func(struct module_reg *reg, const char *name)
 {
-    for (int i = 0; (reg + i) && (reg + i)->name && (reg + i)->func; ++i) {
+    if (reg == NULL)
+        return NULL;
+    for (int i = 0; (reg + i)->name && (reg + i)->func; ++i) {
         if (STR_MATCH((reg + i)->name, name))
             return (reg + i)->func;
     }