isdn: Fix typo in hfcmulti.c

Correcting spelling "extenal" to "external" in hfcmulti.c

Signed-off-by: Masanari Iida <standby24x7@gmail.com>
diff --git a/drivers/isdn/hardware/mISDN/hfcmulti.c b/drivers/isdn/hardware/mISDN/hfcmulti.c
index 4c128e4..9f4e2ef 100644
--- a/drivers/isdn/hardware/mISDN/hfcmulti.c
+++ b/drivers/isdn/hardware/mISDN/hfcmulti.c
@@ -1171,7 +1171,7 @@
 	hc->DTMFbase = 0x1000;
 	if (test_bit(HFC_CHIP_EXRAM_128, &hc->chip)) {
 		if (debug & DEBUG_HFCMULTI_INIT)
-			printk(KERN_DEBUG "%s: changing to 128K extenal RAM\n",
+			printk(KERN_DEBUG "%s: changing to 128K external RAM\n",
 			       __func__);
 		hc->hw.r_ctrl |= V_EXT_RAM;
 		hc->hw.r_ram_sz = 1;
@@ -1182,7 +1182,7 @@
 	}
 	if (test_bit(HFC_CHIP_EXRAM_512, &hc->chip)) {
 		if (debug & DEBUG_HFCMULTI_INIT)
-			printk(KERN_DEBUG "%s: changing to 512K extenal RAM\n",
+			printk(KERN_DEBUG "%s: changing to 512K external RAM\n",
 			       __func__);
 		hc->hw.r_ctrl |= V_EXT_RAM;
 		hc->hw.r_ram_sz = 2;