[PATCH] Fix more "if ((err = foo() < 0))" typos

Another reason to use:

ret = foo();
if (ret < 0)
goto out;

Signed-off-by: Alexey Dobriyan <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

Documentation/kprobes.txt

···
 		printk("Couldn't find %s to plant kprobe\n", "do_fork");
 		return -1;
 	}
-	if ((ret = register_kprobe(&kp) < 0)) {
+	ret = register_kprobe(&kp);
+	if (ret < 0) {
 		printk("register_kprobe failed, returned %d\n", ret);
 		return -1;
 	}

arch/mips/kernel/vpe.c

···
 		return -ENODEV;
 	}
 
-	if ((major = register_chrdev(0, module_name, &vpe_fops) < 0)) {
+	major = register_chrdev(0, module_name, &vpe_fops);
+	if (major < 0) {
 		printk("VPE loader: unable to register character device\n");
 		return major;
 	}

drivers/media/dvb/frontends/mt312.c

···
 	case ID_VP310:
 	// For now we will do this only for the VP310.
 	// It should be better for the mt312 as well, but tunning will be slower. ACCJr 09/29/03
-		if ((ret = mt312_readreg(state, CONFIG, &config_val) < 0))
+		ret = mt312_readreg(state, CONFIG, &config_val);
+		if (ret < 0)
 			return ret;
 		if (p->u.qpsk.symbol_rate >= 30000000) //Note that 30MS/s should use 90MHz
 		{