dmraid: patch dmevent_tool.c to compile on modern gcc versions (#368470)

Author: wineee

pkgs/os-specific/linux/dmraid/default.nix

@@ -16,7 +16,10 @@ stdenv.mkDerivation rec {
   };
 
   patches =
-    [ ./hardening-format.patch ]
+    [
+      ./hardening-format.patch
+      ./fix-dmevent_tool.patch
+    ]
     ++ lib.optionals stdenv.hostPlatform.isMusl [
       (fetchpatch {
         url = "https://raw.githubusercontent.com/void-linux/void-packages/fceed4b8e96b3c1da07babf6f67b6ed1588a28b2/srcpkgs/dmraid/patches/006-musl-libc.patch";

pkgs/os-specific/linux/dmraid/fix-dmevent_tool.patch

@@ -0,0 +1,20 @@
+--- a/1.0.0.rc16/tools/dmevent_tool.c.old	2024-12-26 18:39:04.294039876 -0700
++++ a/1.0.0.rc16/tools/dmevent_tool.c	2024-12-26 18:45:59.416784807 -0700
+@@ -123,7 +123,7 @@
+ }
+ 
+ /* Increment option counters. */
+-static _process_opt(int opt, const char *cmd)
++static int _process_opt(int opt, const char *cmd)
+ {
+ 	struct opt_def_struct {
+ 		const char opt;		/* Option character. */
+@@ -148,7 +148,7 @@
+ 
+ 			optc[o->type]++;
+ 			optc[OPT_SUM]++;
+-			return;
++			return 0;
+ 		}
+ 	}
+