bnxt_en: Remove unnecessary unsigned integer comparison and initialize variable

There is no need to compare *val.vu32* with < 0 because
such variable is of type u32 (32 bits, unsigned), making it
impossible to hold a negative value. Fix this by removing
such comparison.

Also, initialize variable *max_val* to -1, just in case
it is not initialized to either BNXT_MSIX_VEC_MAX or
BNXT_MSIX_VEC_MIN_MAX before using it in a comparison
with val.vu32 at line 159:

	if (val.vu32 > max_val)

Addresses-Coverity-ID: 1473915 ("Unsigned compared against 0")
Addresses-Coverity-ID: 1473920 ("Uninitialized scalar variable")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c

@@ -148,7 +148,7 @@ static int bnxt_dl_msix_validate(struct devlink *dl, u32 id,
 				 union devlink_param_value val,
 				 struct netlink_ext_ack *extack)
 {
-	int max_val;
+	int max_val = -1;
 
 	if (id == DEVLINK_PARAM_GENERIC_ID_MSIX_VEC_PER_PF_MAX)
 		max_val = BNXT_MSIX_VEC_MAX;
@@ -156,7 +156,7 @@ static int bnxt_dl_msix_validate(struct devlink *dl, u32 id,
 	if (id == DEVLINK_PARAM_GENERIC_ID_MSIX_VEC_PER_PF_MIN)
 		max_val = BNXT_MSIX_VEC_MIN_MAX;
 
-	if (val.vu32 < 0 || val.vu32 > max_val) {
+	if (val.vu32 > max_val) {
 		NL_SET_ERR_MSG_MOD(extack, "MSIX value is exceeding the range");
 		return -EINVAL;
 	}