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/it87spi.c b/it87spi.c
index 299725c..d58f837 100644
--- a/it87spi.c
+++ b/it87spi.c
@@ -168,7 +168,7 @@
 	} while (busy);
 	if (readcnt > 3) {
 		printf("%s called with unsupported readcnt %i.\n",
-		       __FUNCTION__, readcnt);
+		       __func__, readcnt);
 		return SPI_INVALID_LENGTH;
 	}
 	switch (writecnt) {
@@ -198,7 +198,7 @@
 		break;
 	default:
 		printf("%s called with unsupported writecnt %i.\n",
-		       __FUNCTION__, writecnt);
+		       __func__, writecnt);
 		return SPI_INVALID_LENGTH;
 	}
 	/*