Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/drivers/isdn/i4l/isdn_net.c b/drivers/isdn/i4l/isdn_net.c
index afeede7..2a7d17c 100644
--- a/drivers/isdn/i4l/isdn_net.c
+++ b/drivers/isdn/i4l/isdn_net.c
@@ -1530,7 +1530,7 @@
 		printk (KERN_WARNING
 				"UPDOWN: Line protocol on Interface %s,"
 				" changed state to down\n", lp->netdev->dev->name);
-		/* should stop routing higher-level data accross */
+		/* should stop routing higher-level data across */
 	} else if ((!lp->cisco_line_state) &&
 		(myseq_diff >= 0) && (myseq_diff <= 2)) {
 		/* line down -> up */
@@ -1538,7 +1538,7 @@
 		printk (KERN_WARNING
 				"UPDOWN: Line protocol on Interface %s,"
 				" changed state to up\n", lp->netdev->dev->name);
-		/* restart routing higher-level data accross */
+		/* restart routing higher-level data across */
 	}
 
 	if (lp->cisco_debserint)
diff --git a/drivers/isdn/i4l/isdn_ppp.c b/drivers/isdn/i4l/isdn_ppp.c
index 9e8162c..1b002b0 100644
--- a/drivers/isdn/i4l/isdn_ppp.c
+++ b/drivers/isdn/i4l/isdn_ppp.c
@@ -1514,7 +1514,7 @@
 #define MP_LONGSEQ_MAXBIT	((MP_LONGSEQ_MASK+1)>>1)
 #define MP_SHORTSEQ_MAXBIT	((MP_SHORTSEQ_MASK+1)>>1)
 
-/* sequence-wrap safe comparisions (for long sequence)*/ 
+/* sequence-wrap safe comparisons (for long sequence)*/
 #define MP_LT(a,b)	((a-b)&MP_LONGSEQ_MAXBIT)
 #define MP_LE(a,b) 	!((b-a)&MP_LONGSEQ_MAXBIT)
 #define MP_GT(a,b) 	((b-a)&MP_LONGSEQ_MAXBIT)
@@ -1746,7 +1746,7 @@
 		 * then next fragment should be the start of new reassembly
 		 * if sequence is contiguous, but we haven't reassembled yet,
 		 * keep going.
-		 * if sequence is not contiguous, either clear everyting
+		 * if sequence is not contiguous, either clear everything
 		 * below low watermark and set start to the next frag or
 		 * clear start ptr.
 		 */ 
diff --git a/drivers/isdn/i4l/isdn_tty.c b/drivers/isdn/i4l/isdn_tty.c
index 3d88f15..607d846 100644
--- a/drivers/isdn/i4l/isdn_tty.c
+++ b/drivers/isdn/i4l/isdn_tty.c
@@ -792,7 +792,7 @@
 }
 
 /* isdn_tty_resume() tries to resume a suspended call
- * setup of the lower levels before that. unfortunatly here is no
+ * setup of the lower levels before that. unfortunately here is no
  * checking for compatibility of used protocols implemented by Q931
  * It does the same things like isdn_tty_dial, the last command
  * is different, may be we can merge it.