Use (uint8_t *) for buf_(set|get)_u(32|64) instead of (void *)

This helps to uncover incorrect usage when a pointer to uint32_t is
passed to those functions which leads to subtle bugs on BE systems.

The reason is that it's normally assumed that any uint32_t variable
holds its value in host byte order, but using but_set_u32 on it
silently does implicit pointer conversion to (void *) and the
assumption ends up broken without any indication.

Change-Id: I48ffd190583d8aa32ec1fef8f1cdc0b4184e4546
Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Reviewed-on: http://openocd.zylin.com/2467
Tested-by: jenkins
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>

src/target/etb.c

@@ -308,7 +308,7 @@ static int etb_write_reg(struct reg *reg, uint32_t value)
 	fields[0].num_bits = 32;
 	uint8_t temp0[4];
 	fields[0].out_value = temp0;
-	buf_set_u32(&temp0, 0, 32, value);
+	buf_set_u32(temp0, 0, 32, value);
 	fields[0].in_value = NULL;
 
 	fields[1].num_bits = 7;