Fix warnings trivial warnings.

Fix warnings about:
 . Unused variables
 . format mismatch in printf/scanf format string and arguments
 . Missing parenthesis around assignment as truth values
 . Clang warnings anout unknown GCC pragma

commands/ramdisk/ramdisk.c

@@ -38,7 +38,7 @@ main(int argc, char *argv[])
 		return 1;
 	}
 
-	fprintf(stderr, "size on %s set to %dkB\n", d, size/KFACTOR);
+	fprintf(stderr, "size on %s set to %ldkB\n", d, size/KFACTOR);
 
 	return 0;
 }