spi/omap: call pm_runtime_disable in error path and remove

omap mcspi probe() doesnt call pm_runtime  disable functions
in case of failure. remove() doesnt call pm_runtime disable. This could
lead to warnings as below on subsequent insmod.

~# insmod spi-omap2-mcspi.ko
[  255.383671] omap2_mcspi omap2_mcspi.1: Unbalanced pm_runtime_enable!
...

This patch adds the pm_runtime disable() at appropriate stages.

Signed-off-by: Hebbar, Gururaja <gururaja.hebbar@ti.com>
Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

drivers/spi/spi-omap2-mcspi.c

@@ -1196,6 +1196,7 @@ static int __init omap2_mcspi_probe(struct platform_device *pdev)
 err4:
 	spi_master_put(master);
 err3:
+	pm_runtime_disable(&pdev->dev);
 	kfree(mcspi->dma_channels);
 err2:
 	release_mem_region(r->start, resource_size(r));
@@ -1217,6 +1218,7 @@ static int __exit omap2_mcspi_remove(struct platform_device *pdev)
 	dma_channels = mcspi->dma_channels;
 
 	omap2_mcspi_disable_clocks(mcspi);
+	pm_runtime_disable(&pdev->dev);
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	release_mem_region(r->start, resource_size(r));