Explicitly initialize 'error' to 0 (two places). It lets one to build tmpfs

from the latest source tree with older compiler--gcc3.

Reviewed by:	kib@ (on freebsd-current@)
Approved by:	cognet@ (mentor)

sys/fs/tmpfs/tmpfs_vnops.c

@@ -529,7 +529,7 @@ tmpfs_read(struct vop_read_args *v)
 	size_t len;
 	int resid;
 
-	int error;
+	int error = 0;
 
 	node = VP_TO_TMPFS_NODE(vp);
 
@@ -576,6 +576,8 @@ tmpfs_mappedwrite(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *ui
 	caddr_t		va;
 	int		error;
 
+	error = 0;
+	
 	addr = uio->uio_offset;
 	idx = OFF_TO_IDX(addr);
 	offset = addr & PAGE_MASK;