i5000: Fix a Panic when a corrected error is reported

As reported by Tamas Vincze <tom@vincze.org>:

EDAC MC0: INTERNAL ERROR: channel-b out of range (4 >= 4)
Kernel panic - not syncing: EDAC MC0: Uncorrected Error  (XEN) Domain 0 crashed: 'noreboot' set - not rebooting.

This happens because FERR_NF_FBD bit 28 is not updated on i5000. Due to that,
both bits 28 and 29 may be equal to one, returning channel = 3. As this
value is invalid, EDAC core generates the panic.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/edac/i5000_edac.c b/drivers/edac/i5000_edac.c
index 77a9579..7113a17 100644
--- a/drivers/edac/i5000_edac.c
+++ b/drivers/edac/i5000_edac.c
@@ -577,7 +577,13 @@ static void i5000_process_nonfatal_error_info(struct mem_ctl_info *mci,
 		debugf0("\tUncorrected bits= 0x%x\n", ue_errors);
 
 		branch = EXTRACT_FBDCHAN_INDX(info->ferr_nf_fbd);
-		channel = branch;
+
+		/*
+	         * According with i5000 datasheet, bit 28 has no significance for
+		 * errors M4Err-M12Err and M17Err-M21Err, on FERR_NF_FBD
+		 */
+		channel = branch & 2;
+
 		bank = NREC_BANK(info->nrecmema);
 		rank = NREC_RANK(info->nrecmema);
 		rdwr = NREC_RDWR(info->nrecmema);