Standardize on using __func__ instead of __FUNCTION__

The __func__ variant is standardized in C99 and recommended to be
used instead of __FUNCTION__ in the gcc info page.

Only _very_ old versions of gcc did not know about __func__, but we've
been using both __func__ and __FUNCTION__ for a long while now, and
nobody complained about this, so all our users seem to use recent
enough compilers.

Corresponding to flashrom svn r711.

Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de>
Acked-by: Stefan Reinauer <stepan@coresystems.de>
diff --git a/ft2232_spi.c b/ft2232_spi.c
index 00490fe..9bf1af3 100644
--- a/ft2232_spi.c
+++ b/ft2232_spi.c
@@ -285,7 +285,7 @@
 			l = total_size - i;
 
 		if ((r = spi_nbyte_program(i, &buf[i], l))) {
-			fprintf(stderr, "%s: write fail %d\n", __FUNCTION__, r);
+			fprintf(stderr, "%s: write fail %d\n", __func__, r);
 			return 1;
 		}