Updates to a number of apps to remove warnings/compile errors under libc5.

Tested under both libc5 and libc6 and all seems well with these fixes.
 -Erik

util-linux/dmesg.c

@@ -128,6 +128,5 @@ int dmesg_main(int argc, char **argv)
 	exit(FALSE);
   klogctl_error:
 	perror("klogctl");
-	exit(FALSE);
-
+	return(FALSE);
 }

util-linux/fbset.c

@@ -329,5 +329,5 @@ extern int fbset_main(int argc, char **argv)
 	/* Don't close the file, as exiting will take care of that */
 	/* close(fh); */
 
-	exit (TRUE);
+	return (TRUE);
 }

util-linux/fdflush.c

@@ -56,5 +56,5 @@ extern int fdflush_main(int argc, char **argv)
 		perror(*argv);
 		exit(FALSE);
 	}
-	exit(TRUE);
+	return(TRUE);
 }

util-linux/freeramdisk.c

@@ -58,7 +58,7 @@ freeramdisk_main(int argc, char **argv)
 	/* Don't bother closing.  Exit does
 	 * that, so we can save a few bytes */
 	/* close(f); */
-	exit(TRUE);
+	return(TRUE);
 }
 
 /*

util-linux/mkswap.c

@@ -469,5 +469,5 @@ the -f option to force it.\n", program_name, device_name);
 	 */
 	if (fsync(DEV))
 		die("fsync failed");
-	exit(TRUE);
+	return(TRUE);
 }

util-linux/more.c

@@ -221,5 +221,5 @@ extern int more_main(int argc, char **argv)
 #ifdef BB_FEATURE_USE_TERMIOS
 	gotsig(0);
 #endif
-	exit(TRUE);
+	return(TRUE);
 }