[PATCH -next] coresight: stm: remove set but not used variable 'res_size'

[YueHaibing]

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/hwtracing/coresight/coresight-stm.c: In function 'stm_probe':
drivers/hwtracing/coresight/coresight-stm.c:796:9: warning:
 variable 'res_size' set but not used [-Wunused-but-set-variable]

It never used since introduction in commit
237483aa5cf4 ("coresight: stm: adding driver for CoreSight STM component")

Signed-off-by: YueHaibing <yuehaib...@huawei.com>
---
 drivers/hwtracing/coresight/coresight-stm.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-stm.c 
b/drivers/hwtracing/coresight/coresight-stm.c
index ef339ff..f07825d 100644
--- a/drivers/hwtracing/coresight/coresight-stm.c
+++ b/drivers/hwtracing/coresight/coresight-stm.c
@@ -793,7 +793,7 @@ static int stm_probe(struct amba_device *adev, const struct 
amba_id *id)
        struct stm_drvdata *drvdata;
        struct resource *res = &adev->res;
        struct resource ch_res;
-       size_t res_size, bitmap_size;
+       size_t bitmap_size;
        struct coresight_desc desc = { 0 };
        struct device_node *np = adev->dev.of_node;
 
@@ -833,15 +833,11 @@ static int stm_probe(struct amba_device *adev, const 
struct amba_id *id)
 
        drvdata->write_bytes = stm_fundamental_data_size(drvdata);
 
-       if (boot_nr_channel) {
+       if (boot_nr_channel)
                drvdata->numsp = boot_nr_channel;
-               res_size = min((resource_size_t)(boot_nr_channel *
-                                 BYTES_PER_CHANNEL), resource_size(res));
-       } else {
+       else
                drvdata->numsp = stm_num_stimulus_port(drvdata);
-               res_size = min((resource_size_t)(drvdata->numsp *
-                                BYTES_PER_CHANNEL), resource_size(res));
-       }
+
        bitmap_size = BITS_TO_LONGS(drvdata->numsp) * sizeof(long);
 
        guaranteed = devm_kzalloc(dev, bitmap_size, GFP_KERNEL);