octeontx2-af: fix memory leak in rvu_setup_hw_resources()

octeontx2-af: fix memory leak in rvu_setup_hw_resources()

If rvu_npc_exact_init() fails in rvu_setup_hw_resources(), the function
returns directly instead of jumping to the error handling path. This
causes a resource leak for the previously initialized CGX, NPC, fwdata,
and MSI-X states.

Fix this by replacing the direct return with goto cgx_err to ensure
proper cleanup.

The bug was first flagged by an experimental analysis tool we are
developing for kernel memory-management bugs while analyzing
v6.13-rc1. The tool is still under development and is not yet publicly
available. Manual inspection confirms that the bug is still present in
v7.1-rc6.

An x86_64 allyesconfig build showed no new warnings. As we do not have
access to Marvell OcteonTX2 RVU AF hardware to test with, no runtime
testing was able to be performed.

Fixes: 3571fe07a090 ("octeontx2-af: Drop rules for NPC MCAM")
Cc: stable@vger.kernel.org
Signed-off-by: Dawei Feng <dawei.feng@seu.edu.cn>
Signed-off-by: Zilin Guan <zilin@seu.edu.cn>
Link: https://patch.msgid.link/20260604143756.1524482-1-dawei.feng@seu.edu.cn
Signed-off-by: Paolo Abeni <pabeni@redhat.com>