fix ia64 compile failure with gcc4.1

[Dave Jones <davej@redhat.com>]

__get_unaligned creates a typeof the var its passed, and writes to it,
which on gcc4.1, spits out the following error:

drivers/char/vc_screen.c: In function 'vcs_write':
drivers/char/vc_screen.c:422: error: assignment of read-only variable 'val'

Signed-off-by: Dave Jones <davej@redhat.com>

--- linux-2.6.14/drivers/char/vc_screen.c~	2005-12-06 23:20:03.000000000 -0500
+++ linux-2.6.14/drivers/char/vc_screen.c	2005-12-06 23:21:35.000000000 -0500
@@ -419,7 +419,7 @@ vcs_write(struct file *file, const char 
 			while (this_round > 1) {
 				unsigned short w;
 
-				w = get_unaligned(((const unsigned short *)con_buf0));
+				w = get_unaligned(((unsigned short *)con_buf0));
 				vcs_scr_writew(vc, w, org++);
 				con_buf0 += 2;
 				this_round -= 2;


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