openocd: remove NULL comparisons with checkpatch [2/2]

Patch generated automatically through a modified checkpatch that
detects the patterns
	if (NULL == symbol)
	if (NULL != symbol)
and through flags "--types COMPARISON_TO_NULL --fix-inplace".

The unmodified checkpatch detects this pattern as Yoda condition,
but it's odd fixing it as Yoda condition and then again as NULL
comparison. This triggered the modification to the script.

Change-Id: I5fe984a85e9c4fc799f049211797aef891ebce18
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/6352
Tested-by: jenkins

src/helper/binarybuffer.c

@@ -53,7 +53,7 @@ static const char hex_digits[] = {
 
 void *buf_cpy(const void *from, void *_to, unsigned size)
 {
-	if (NULL == from || NULL == _to)
+	if (!from || !_to)
 		return NULL;
 
 	/* copy entire buffer */