[PATCH -mm] idetape gcc 4.1 warning fix

[Daniel Walker <dwalker@mvista.com>]

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Fixes the following warning,

drivers/ide/ide-tape.c: In function ‘idetape_copy_stage_from_user’:
drivers/ide/ide-tape.c:2662: warning: ignoring return value of ‘copy_from_user’, declared with attribute warn_unused_result
drivers/ide/ide-tape.c: In function ‘idetape_copy_stage_to_user’:
drivers/ide/ide-tape.c:2689: warning: ignoring return value of ‘copy_to_user’, declared with attribute warn_unused_result

Signed-Off-By: Daniel Walker <dwalker@mvista.com>

Index: linux-2.6.16/drivers/ide/ide-tape.c
===================================================================
--- linux-2.6.16.orig/drivers/ide/ide-tape.c
+++ linux-2.6.16/drivers/ide/ide-tape.c
@@ -2659,7 +2659,7 @@ static void idetape_copy_stage_from_user
 		}
 #endif /* IDETAPE_DEBUG_BUGS */
 		count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), (unsigned int)n);
-		copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, count);
+		WARN_ON(copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, count));
 		n -= count;
 		atomic_add(count, &bh->b_count);
 		buf += count;
@@ -2686,7 +2686,7 @@ static void idetape_copy_stage_to_user (
 		}
 #endif /* IDETAPE_DEBUG_BUGS */
 		count = min(tape->b_count, n);
-		copy_to_user(buf, tape->b_data, count);
+		WARN_ON(copy_to_user(buf, tape->b_data, count));
 		n -= count;
 		tape->b_data += count;
 		tape->b_count -= count;