fix segfault on set break opline address

phpdbg_bp.c

@@ -143,7 +143,7 @@ void phpdbg_set_breakpoint_opline(zend_ulong opline TSRMLS_DC) /* {{{ */
 
 		zend_hash_index_update(&PHPDBG_G(bp)[PHPDBG_BREAK_OPLINE], opline, &new_break, sizeof(phpdbg_breakline_t), NULL);
 
-	    phpdbg_notice("Breakpoint #%d added at %#lx%s",
+	    phpdbg_notice("Breakpoint #%d added at %#lx",
 			new_break.id, new_break.opline);
 	} else {
 	    phpdbg_notice("Breakpoint exists at %#lx", opline);

phpdbg_print.c

@@ -90,7 +90,7 @@ PHPDBG_PRINT(class) /* {{{ */
 	                    
 	                    default: {
 	                        phpdbg_writeln(
-	                            "\tInternal Method %s::%s()", (*ce)->name, method->common.function_name);
+	                            "\tInternal %s::%s()", (*ce)->name, method->common.function_name);
 	                    }
 	                 }
 	            }

phpdbg_utils.c

@@ -74,11 +74,13 @@ int phpdbg_is_class_method(const char *str, size_t len, char **class, char **met
 void phpdbg_print(int type TSRMLS_DC, const char *format, ...) /* {{{ */
 {
 	char *buffer = NULL;
-	va_list args;
+	va_list args = {0};
 
-	va_start(args, format);
-	vspprintf(&buffer, 0, format, args);
-	va_end(args);
+	if (format != NULL && strlen(format) > 0L) {
+	    va_start(args, format);
+	    vspprintf(&buffer, 0, format, args);
+	    va_end(args);
+	}
 
     /* TODO(anyone) colours */