Remove a 'break' that was accidentally left over

The conversion of the 'switch' statement to an 'if' cascade forgot to
remove the break.

Signed-off-by: Johannes Sixt <johannes.sixt@telecom.at>

setup.c

@@ -35,7 +35,6 @@ static int sanitary_path_copy(char *dst, const char *src)
 			if (!src[1]) {
 				/* (1) */
 				src++;
-				break;
 			} else if (is_dir_sep(src[1])) {
 				/* (2) */
 				src += 2;