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stmmac: intel: Fix warning message for return value in intel_tsn_lane_is_available()

Fix the warning "warn: missing error code? 'ret'" in the
intel_tsn_lane_is_available() function.

The function now returns 0 to indicate that a TSN lane was found and
returns -EINVAL when it is not found.

Fixes: a42f6b3f1cc1 ("net: stmmac: configure SerDes according to the interface mode")
Signed-off-by: Choong Yong Liang <yong.liang.choong@linux.intel.com>
Reviewed-by: Kory Maincent <kory.maincent@bootlin.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250310050835.808870-1-yong.liang.choong@linux.intel.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

authored by

Choong Yong Liang and committed by
Paolo Abeni 38f13bf8 f2972ea1

+2 -2
+2 -2
drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
··· 494 494 if ((rbuf.buf[0] >> 495 495 (4 * (intel_priv->tsn_lane_regs[j] % 8)) & 496 496 B_PCH_FIA_PCR_L0O) == 0xB) 497 - return ret; 497 + return 0; 498 498 } 499 499 500 - return ret; 500 + return -EINVAL; 501 501 } 502 502 503 503 static int intel_set_reg_access(const struct pmc_serdes_regs *regs, int max_regs)