ci: symbol_depend: Fix endif block detection

[gastmaier]

PR Description

Consider lines that start with endif, since it may have comments.
Detected by run of #2913
https://github.com/analogdevicesinc/linux/actions/runs/17266053343/job/48998303938?pr=2913

Create deadcode_exceptions file, for API code mostly, to reduce noise from #2909

Demote assert_compiled step, for in case of API code not added yet to the deadcode_exceptions file, still run the next steps, also #2909

PR Type

• Bug fix (a change that fixes an issue)
• New feature (a change that adds new functionality)
• Breaking change (a change that affects other repos or cause CIs to fail)

PR Checklist

• I have conducted a self-review of my own code changes
• I have tested the changes on the relevant hardware
• I have updated the documentation outside this repo accordingly (if there is the case)

[gastmaier]

@pamolloy your oran branch will fail with

Warning: kernel: format '%llx' expects argument of type 'long long unsigned int', but argument 4 has type 'dma_addr_t' {aka 'unsigned int'} [-Wformat=]
 525 | dev_dbg(dma->dev, "dma config: src = 0x%llx, dst = 0x%llx\n", desc->src, desc->dest);
 | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Warning: kernel: format '%llx' expects argument of type 'long long unsigned int', but argument 5 has type 'dma_addr_t' {aka 'unsigned int'} [-Wformat=]
 525 | dev_dbg(dma->dev, "dma config: src = 0x%llx, dst = 0x%llx\n", desc->src, desc->dest);
 | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Warning: kernel: left shift count >= width of type [-Wshift-count-overflow]
 7 | #define BIT(nr) (UL(1) << (nr))
 | ^~
Warning: kernel: left shift count >= width of type [-Wshift-count-overflow]
 8 | (((~_UL(0)) - (_UL(1) << (l)) + 1) & \
 | ^~
Warning: kernel: right shift count is negative [-Wshift-count-negative]
 9 | (~_UL(0) >> (__BITS_PER_LONG - 1 - (h))))
 | ^~
Warning: kernel: no previous prototype for 'adrv906x_phc_pll_probe' [-Wmissing-prototypes]
 337 | int adrv906x_phc_pll_probe(struct adrv906x_phc_pll *pll_phc)
 | ^~~~~~~~~~~~~~~~~~~~~~
Warning: kernel: no previous prototype for 'adrv906x_pll_remove' [-Wmissing-prototypes]
 384 | int adrv906x_pll_remove(struct adrv906x_phc_pll *pll_phc)
 | ^~~~~~~~~~~~~~~~~~~
drivers/ptp/ptp_adrv906x_soc.c: In function 'adrv906x_ptp_remove':
Error: kernel: void value not ignored as it ought to be
 431 | ret = adrv906x_tod_remove(pdev);
 | ^
drivers/ptp/ptp_adrv906x_soc.c: At top level:
Error: kernel: initialization of 'void (*)(struct platform_device *)' from incompatible pointer type 'int (*)(struct platform_device *)' [-Wincompatible-pointer-types]
 451 | .remove = adrv906x_ptp_remove,
 | ^~~~~~~~~~~~~~~~~~~
Error: Process completed with exit code 1.