correct console log level when ERST ACPI table is not found

When booting 2.6.35-rc3 on a x86 system without an ERST ACPI table with
the 'quiet' option, we still observe an "ERST: Table is not found!"
warning.

Quiesce it to the same info log level as the other 'table not found'
warnings.
Signed-off-by: NDaniel J Blueman <daniel.blueman@gmail.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/acpi/apei/erst.c

@@ -781,7 +781,7 @@ static int __init erst_init(void)
 	status = acpi_get_table(ACPI_SIG_ERST, 0,
 				(struct acpi_table_header **)&erst_tab);
 	if (status == AE_NOT_FOUND) {
-		pr_err(ERST_PFX "Table is not found!\n");
+		pr_info(ERST_PFX "Table is not found!\n");
 		goto err;
 	} else if (ACPI_FAILURE(status)) {
 		const char *msg = acpi_format_exception(status);