mtd: fix memory leaks in phram_setup

There are two code paths in drivers/mtd/devices/phram.c::phram_setup() that
will leak memory.
Memory is allocated to the variable 'name' with kmalloc() by the
parse_name() function, but if we leave by way of the parse_err() macro,
then that memory is never kfree()'d, nor is it ever used with
register_device() so it won't be freed later either - leak.

Found by the Coverity checker as #593 - simple fix below.
Signed-off-by: NJesper Juhl <jesper.juhl@gmail.com>
Signed-off-by: NDavid Woodhouse <dwmw2@infradead.org>

drivers/mtd/devices/phram.c

@@ -266,12 +266,16 @@ static int phram_setup(const char *val, struct kernel_param *kp)
 		return 0;
 
 	ret = parse_num32(&start, token[1]);
-	if (ret)
+	if (ret) {
+		kfree(name);
 		parse_err("illegal start address\n");
+	}
 
 	ret = parse_num32(&len, token[2]);
-	if (ret)
+	if (ret) {
+		kfree(name);
 		parse_err("illegal device length\n");
+	}
 
 	register_device(name, start, len);