fix #40815 (using strings like "class::func" and static methods in set_exception_handler() might result in crash)

Zend/tests/bug40815.phpt

@@ -0,0 +1,18 @@
+--TEST--
+Bug #40815 (using strings like "class::func" and static methods in set_exception_handler() might result in crash).
+--FILE--
+<?php
+
+class ehandle{
+	static public function exh ($ex) {
+		echo 'foo';
+	}
+}
+
+set_exception_handler("ehandle::exh");
+
+throw new Exception ("Whiii");
+echo "Done\n";
+?>
+--EXPECTF--	
+foo

Zend/zend.c

@@ -1146,6 +1146,9 @@ ZEND_API int zend_execute_scripts(int type TSRMLS_DC, zval **retval, int file_co
 							zval_ptr_dtor(&retval2);
 						}
 					} else {
+						if (!EG(exception)) {
+							EG(exception) = old_exception;
+						}
 						zend_exception_error(EG(exception) TSRMLS_CC);
 					}
 					efree(params);

Zend/zend_execute_API.c

@@ -750,7 +750,7 @@ int zend_call_function(zend_fcall_info *fci, zend_fcall_info_cache *fci_cache TS
 
 		fname = Z_STRVAL_P(fci->function_name);
 		fname_len = Z_STRLEN_P(fci->function_name);
-		if (calling_scope && (colon = strstr(fname, "::")) != NULL) {
+		if ((colon = strstr(fname, "::")) != NULL) {
 			int clen = colon - fname;
 			int mlen = fname_len - clen - 2;
 			zend_class_entry **pce, *ce_child = NULL;