xfs: Add log level to assertion printk

I received a ppc64 bug report involving xfs but the assertion was
filtered out by the console log level. Use KERN_CRIT to ensure it
makes it out.

Signed-off-by: Anton Blanchard <anton@samba.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>

fs/xfs/support/debug.c

@@ -104,7 +104,8 @@ xfs_fs_vcmn_err(
 void
 assfail(char *expr, char *file, int line)
 {
-	printk("Assertion failed: %s, file: %s, line: %d\n", expr, file, line);
+	printk(KERN_CRIT "Assertion failed: %s, file: %s, line: %d\n", expr,
+	       file, line);
 	BUG();
 }