cli_classic.c: Convert do_erase() to libflashrom call

Inline emergency_help_message() to cli_classic call site.
This leaves do_erase() a redudant wrapper and moves us a step
closer to cli_classic as a pure libflashrom user by using
flashrom_flash_erase().

Tested: `flashrom -E`

Change-Id: I8566164e7dbad69cf478b24208014f10fb99e4d0
Signed-off-by: Edward O'Callaghan <quasisec@google.com>
Original-Reviewed-on: https://review.coreboot.org/c/flashrom/+/60068
Original-Reviewed-by: Nico Huber <nico.h@gmx.de>
Original-Reviewed-by: Anastasia Klimchuk <aklm@chromium.org>
Reviewed-on: https://review.coreboot.org/c/flashrom-stable/+/72287
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/cli_classic.c b/cli_classic.c
index 9a6b6c0..882ea2e 100644
--- a/cli_classic.c
+++ b/cli_classic.c
@@ -668,8 +668,18 @@
 	programmer_delay(100000);
 	if (read_it)
 		ret = do_read(fill_flash, filename);
-	else if (erase_it)
-		ret = do_erase(fill_flash);
+	else if (erase_it) {
+		ret = flashrom_flash_erase(fill_flash);
+		/*
+		 * FIXME: Do we really want the scary warning if erase failed?
+		 * After all, after erase the chip is either blank or partially
+		 * blank or it has the old contents. A blank chip won't boot,
+		 * so if the user wanted erase and reboots afterwards, the user
+		 * knows very well that booting won't work.
+		 */
+		if (ret)
+			emergency_help_message();
+	}
 	else if (write_it)
 		ret = do_write(fill_flash, filename, referencefile);
 	else if (verify_it)