cli: avoid buffer overrun

Invoking the sandbox with

    /u-boot -c ⧵0xef⧵0xbf⧵0xbd

results in a segmentation fault.

Function b_getch() retrieves a character from the input stream. This
character may be > 0x7f. If type char is signed, static_get() will
return a negative number and in parse_stream() we will use that
negative number as an index for array map[] resulting in a buffer
overflow.

Reported-by: Harry Lockyer <harry_lockyer@tutanota.com>
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

common/cli_hush.c

@@ -324,7 +324,7 @@ typedef struct {
 /* I can almost use ordinary FILE *.  Is open_memstream() universally
  * available?  Where is it documented? */
 struct in_str {
-	const char *p;
+	const unsigned char *p;
 #ifndef __U_BOOT__
 	char peek_buf[2];
 #endif