misc: remove superfluous null pointer checks for optarg

This is only needed for optional arguments.

Signed-off-by: Ruediger Meier <ruediger.meier@ga-group.nl>

login-utils/chsh.c

@@ -235,8 +235,6 @@ static void parse_argv(int argc, char **argv, struct sinfo *pinfo)
 			print_shells();
 			exit(EXIT_SUCCESS);
 		case 's':
-			if (!optarg)
-				usage(stderr);
 			pinfo->shell = optarg;
 			break;
 		default:

login-utils/lslogins.c

@@ -1381,15 +1381,12 @@ int main(int argc, char *argv[])
 			outmode = OUT_NEWLINE;
 			break;
 		case 'o':
-			if (optarg) {
-				if (*optarg == '=')
-					optarg++;
-				ncolumns = string_to_idarray(optarg,
-						columns, ARRAY_SIZE(columns),
-						column_name_to_id);
-				if (ncolumns < 0)
-					return EXIT_FAILURE;
-			}
+			if (*optarg == '=')
+				optarg++;
+			ncolumns = string_to_idarray(optarg, columns,
+					ARRAY_SIZE(columns), column_name_to_id);
+			if (ncolumns < 0)
+				return EXIT_FAILURE;
 			opt_o = 1;
 			break;
 		case 'r':

text-utils/hexdump.c

@@ -107,7 +107,7 @@ parse_args(int argc, char **argv, struct hexdump *hex)
 		case 'f':
 			addfile(optarg, hex);
 			break;
-                case 'L':
+		case 'L':
 			colormode = UL_COLORMODE_AUTO;
 			if (optarg)
 				colormode = colormode_or_err(optarg,