platform/mellanox: mlxbf-pmc: Remove newline char from event name input

Since the input string passed via the command line appends a newline char,
it needs to be removed before comparison with the event_list.

Fixes: 1a218d3 ("platform/mellanox: mlxbf-pmc: Add Mellanox BlueField PMC driver")
Signed-off-by: Shravan Kumar Ramani <shravankr@nvidia.com>
Reviewed-by: David Thompson <davthompson@nvidia.com>
Link: https://lore.kernel.org/r/4978c18e33313b48fa2ae7f3aa6dbcfce40877e4.1751380187.git.shravankr@nvidia.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

Author: shravankumarr

drivers/platform/mellanox/mlxbf-pmc.c

@@ -15,6 +15,7 @@
 #include <linux/hwmon.h>
 #include <linux/platform_device.h>
 #include <linux/string.h>
+#include <linux/string_helpers.h>
 #include <uapi/linux/psci.h>
 
 #define MLXBF_PMC_WRITE_REG_32 0x82000009
@@ -1784,15 +1785,22 @@ static ssize_t mlxbf_pmc_event_store(struct device *dev,
 		attr, struct mlxbf_pmc_attribute, dev_attr);
 	unsigned int blk_num, cnt_num;
 	bool is_l3 = false;
+	char *evt_name;
 	int evt_num;
 	int err;
 
 	blk_num = attr_event->nr;
 	cnt_num = attr_event->index;
 
 	if (isalpha(buf[0])) {
+		/* Remove the trailing newline character if present */
+		evt_name = kstrdup_and_replace(buf, '\n', '\0', GFP_KERNEL);
+		if (!evt_name)
+			return -ENOMEM;
+
 		evt_num = mlxbf_pmc_get_event_num(pmc->block_name[blk_num],
-						  buf);
+						  evt_name);
+		kfree(evt_name);
 		if (evt_num < 0)
 			return -EINVAL;
 	} else {