[Fix]: software: kernel: ft-debug: The code returns false failure

After this: commit b208e2f7 ("software: kernel: ft-debug: Update API 'debugfs_create_regset32'") The pointer `ft->dbg_reg` was never initialized. And when we check it for "IS_ERR_ORNULL", we get false failure. Thus, put conditional directive for this API update. Signed-off-by: Vaibhav Gupta <vaibhav.gupta@cern.ch>

[Fix]: software: kernel: ft-debug: The code returns false failure
After this: commit b208e2f7 ("software: kernel: ft-debug: Update API 'debugfs_create_regset32'") The pointer `ft->dbg_reg` was never initialized. And when we check it for "IS_ERR_ORNULL", we get false failure. Thus, put conditional directive for this API update. Signed-off-by: Vaibhav Gupta <vaibhav.gupta@cern.ch>
bf952e0e · Vaibhav Gupta · 711bde0f · bf952e0e
Commit bf952e0e authored Nov 30, 2022 by Vaibhav Gupta
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ft-debug.c software/kernel/ft-debug.c +6 -0

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--- a/software/kernel/ft-debug.c
+++ b/software/kernel/ft-debug.c
@@ -58,14 +58,20 @@ int ft_debug_init(struct fmctdc_dev *ft)
 		ft->dbg_reg32.regs = ft_debugfs_reg32;
 		ft->dbg_reg32.nregs = ARRAY_SIZE(ft_debugfs_reg32);
 		ft->dbg_reg32.base = ft->ft_base;
+#if KERNEL_VERSION(5, 6, 0) <= LINUX_VERSION_CODE
 		debugfs_create_regset32("regs", 0444, ft->dbg_dir,
 					&ft->dbg_reg32);
+#else
+		ft->dbg_reg = debugfs_create_regset32("regs", 0444,
+							ft->dbg_dir,
+							&ft->dbg_reg32);
 		if (IS_ERR_OR_NULL(ft->dbg_reg)) {
 			err = PTR_ERR(ft->dbg_reg);
 			dev_warn(&ft->pdev->dev,
 				 "Cannot create debugfs file \"regs\" (%d)\n",
 				 err);
 		}
+#endif
 		break;
 	default:
 		break;