Fix all stdio reading functions to be __critical

Oh, right SDCC has '__critical' to mark sections of code that need to
run with interrupts disabled; no need to use EA = 0 and EA = 1.

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/ao_usb.c b/src/ao_usb.c
index 527e9b30..e4af8e45 100644
--- a/src/ao_usb.c
+++ b/src/ao_usb.c
@@ -395,7 +395,7 @@ ao_usb_pollchar(void) __critical
 }
 
 char
-ao_usb_getchar(void)
+ao_usb_getchar(void) __critical
 {
 	char	c;