Documentation/spi/spidev_test.c: fix warning

Documentation/spi/spidev_test.c:83:5: warning: no previous prototype for 'unespcape' [-Wmissing-prototypes]

fix spelling too.

Acked-by: Mark Brown <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

Documentation/spi/spidev_test.c

···
  *  Unescape - process hexadecimal escape character
  *      converts shell input "\x23" -> 0x23
  */
-int unespcape(char *_dst, char *_src, size_t len)
+static int unescape(char *_dst, char *_src, size_t len)
 {
 	int ret = 0;
 	char *src = _src;
···
 		size = strlen(input_tx+1);
 		tx = malloc(size);
 		rx = malloc(size);
-		size = unespcape((char *)tx, input_tx, size);
+		size = unescape((char *)tx, input_tx, size);
 		transfer(fd, tx, rx, size);
 		free(rx);
 		free(tx);