Fix #82: Revert parts of 34a1524 and add workaround from Void Linux

In commit 34a1524 the start of udevd was refactored to allow it to be a
properly monitored service caused systems using eudev to malfunction.

This patch reverts part of that commit and adds a workaround found when
trying to reproduce issue #82 on Void Linux:

   - Start a temporary udevd in the background
   - Call udevadm to trigger bringup of all subsystems and devices
   - Wait for everything to settle
   - Tell temporary udevd to exit (new)

In the world of `mdev` this song and dance act is not required.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

src/finit.c

@@ -350,7 +350,7 @@ int main(int argc, char* argv[])
 		run_interactive("mdev -s", "Populating device tree");
 	} else {
 		char *cmd;
-		char line[80];
+		char line[256];
 
 		cmd = which("udevd");
 		if (!cmd)
@@ -364,8 +364,19 @@ int main(int argc, char* argv[])
 				udev = 0;
 			}
 
-			free(cmd);
 		}
+
+		snprintf(line, sizeof(line), "%s --daemon", cmd);
+		run_interactive(line, "Populating device tree");
+
+		if (udev && whichp("udevadm")) {
+			run("udevadm trigger --action=add --type=subsystems");
+			run("udevadm trigger --action=add --type=devices");
+			run("udevadm settle --timeout=120");
+			run("udevadm control --exit");
+		}
+
+		free(cmd);
 	}
 
 	/*
@@ -419,13 +430,6 @@ int main(int argc, char* argv[])
 	sm_init(&sm);
 	sm_step(&sm);
 
-	/* On udev systems we can now talk to udevd */
-	if (udev && whichp("udevadm")) {
-		run("udevadm trigger --action=add --type=subsystems");
-		run("udevadm trigger --action=add --type=devices");
-		run("udevadm settle --timeout=120");
-	}
-
 	/*
 	 * Network stuff
 	 */