*print.c (Fexternal_debugging_output): Use more-conservative overflow fix.

src/ChangeLog

@@ -554,8 +554,7 @@
 	Use ptrdiff_t, not int, to avoid needless 32-bit limit on 64-bit hosts.
 	(PRINTPREPARE): Use int, not ptrdiff_t, where int is wide enough.
 	(printchar, strout): Use xpalloc to catch size calculation overflow.
-	(Fexternal_debugging_output): Use CHECK_CHARACTER, not CHECK_NUMBER,
-	to avoid mishandling large integers.
+	(Fexternal_debugging_output): Don't overflow EMACS_INT->int conversion.
 	(print_error_message): Use SAFE_ALLOCA, not alloca.
 	(print_object): Use int, not EMACS_INT, where int is wide enough.
 	* process.c (Fdelete_process): Don't assume pid fits into EMACS_INT.

src/print.c

@@ -716,8 +716,8 @@ You can call print while debugging emacs, and pass it this function
 to make it write to the debugging output.  */)
   (Lisp_Object character)
 {
-  CHECK_CHARACTER (character);
-  putc ((int) XINT (character), stderr);
+  CHECK_NUMBER (character);
+  putc (XINT (character) & 0xFF, stderr);
 
 #ifdef WINDOWSNT
   /* Send the output to a debugger (nothing happens if there isn't one).  */