ipmi_si: Fix error handling of platform device

Cleanup of platform devices created by the IPMI driver was not
being done correctly and could result in a memory leak.  So
create a local boolean to know how to clean up those platform
devices.

Reported-by: David Binderman <dcb314@hotmail.com>
Signed-off-by: Corey Minyard <cminyard@mvista.com>

drivers/char/ipmi/ipmi_si_intf.c

@@ -2045,6 +2045,7 @@ static int try_smi_init(struct smi_info *new_smi)
 	int rv = 0;
 	int i;
 	char *init_name = NULL;
+	bool platform_device_registered = false;
 
 	pr_info(PFX "Trying %s-specified %s state machine at %s address 0x%lx, slave address 0x%x, irq %d\n",
 		ipmi_addr_src_to_str(new_smi->io.addr_source),
@@ -2173,6 +2174,7 @@ static int try_smi_init(struct smi_info *new_smi)
 				rv);
 			goto out_err;
 		}
+		platform_device_registered = true;
 	}
 
 	dev_set_drvdata(new_smi->io.dev, new_smi);
@@ -2279,10 +2281,11 @@ static int try_smi_init(struct smi_info *new_smi)
 	}
 
 	if (new_smi->pdev) {
-		platform_device_unregister(new_smi->pdev);
+		if (platform_device_registered)
+			platform_device_unregister(new_smi->pdev);
+		else
+			platform_device_put(new_smi->pdev);
 		new_smi->pdev = NULL;
-	} else if (new_smi->pdev) {
-		platform_device_put(new_smi->pdev);
 	}
 
 	kfree(init_name);