ANDROID: GKI: update the abi .xml file due to hex_to_bin() changes

Commit 0f509c4428 ("hex2bin: make the function hex_to_bin
constant-time") in 4.19.242 changed the signature of the hex_to_bin()
function to fix a key leak attack vector.  This is not an abi break as
older modules that use the function will still work properly, and the
CRC is preserved, but this resolves any issues going forward as well.

Leaf changes summary: 1 artifact changed (1 filtered out)
Changed leaf types summary: 0 (1 filtered out) leaf type changed
Removed/Changed/Added functions summary: 0 Removed, 1 Changed, 0 Added function
Removed/Changed/Added variables summary: 0 Removed, 0 Changed, 0 Added variable

1 function with some sub-type change:

  [C] 'function int hex_to_bin(char)' at hexdump.c:56:1 has some sub-type changes:
    parameter 1 of type 'char' changed:
      type name changed from 'char' to 'unsigned char'
      type size hasn't changed

Fixes: 0f509c4428 ("hex2bin: make the function hex_to_bin constant-time")
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I26b2283300369049abc831072df9a5ace3e770d1

include/linux/kernel.h

@@ -604,7 +604,11 @@ static inline char *hex_byte_pack_upper(char *buf, u8 byte)
 	return buf;
 }
 
+#ifdef __GENKSYMS__
+extern int hex_to_bin(char ch);
+#else
 extern int hex_to_bin(unsigned char ch);
+#endif
 extern int __must_check hex2bin(u8 *dst, const char *src, size_t count);
 extern char *bin2hex(char *dst, const void *src, size_t count);
 

lib/hexdump.c

@@ -46,7 +46,15 @@ EXPORT_SYMBOL(hex_asc_upper);
  *	uppercase and lowercase letters, so we use (ch & 0xdf), which converts
  *	lowercase to uppercase
  */
+/*
+ * perserve abi due to 15b78a8e38e8 ("hex2bin: make the function hex_to_bin
+ * constant-time"
+ */
+#ifdef __GENKSYMS__
+int hex_to_bin(char ch)
+#else
 int hex_to_bin(unsigned char ch)
+#endif
 {
 	unsigned char cu = ch & 0xdf;
 	return -1 +