misc: set error code when devm_kstrdup fails

In function sram_reserve_regions(), the value of return variable ret
should be negative on failures. However, the value of ret may be 0 even
if the call to devm_kstrdup() returns a NULL pointer. This patch
explicitly assigns "-ENOMEM" to ret on the path that devm_kstrdup()
fails.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=188651

Signed-off-by: Pan Bian <bianpan2016@163.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/sram.c

@@ -249,8 +249,10 @@ static int sram_reserve_regions(struct sram_dev *sram, struct resource *res)
 
 			block->label = devm_kstrdup(sram->dev,
 						    label, GFP_KERNEL);
-			if (!block->label)
+			if (!block->label) {
+				ret = -ENOMEM;
 				goto err_chunks;
+			}
 
 			dev_dbg(sram->dev, "found %sblock '%s' 0x%x-0x%x\n",
 				block->export ? "exported " : "", block->label,