drivers/char/agp/parisc-agp.c: eliminate memory leak

alloc_pci_dev allocates some memory, so that memory should be freed before
leaving the function in an error case.

A simplified version of the semantic match that finds this problem is:
(http://coccinelle.lip6.fr/)

// <smpl>
@r exists@
local idexpression x;
expression E;
identifier f1;
iterator I;
@@

x = alloc_pci_dev(...);
<... when != x
when != true (x == NULL || ...)
when != if (...) { <+...x...+> }
when != I (...) { <+...x...+> }
(
x == NULL
|
x == E
|
x->f1
)
...>
* return ...;
// </smpl>

Signed-off-by: Julia Lawall <[e-mail]>
Dan Carpenter <[e-mail]>
Dave Airlie <[e-mail]>
Cc: Helge Deller <[e-mail]>
Cc: "James E.J. Bottomley" <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Kyle McMartin <[e-mail]>

drivers/char/agp/parisc-agp.c

···
 	bridge->dev = fake_bridge_dev;
 
 	error = agp_add_bridge(bridge);
+	if (error)
+		goto fail;
+	return 0;
 
 fail:
+	kfree(fake_bridge_dev);
 	return error;
 }