Fix typo by adding a semicolon

Signed-off-by: Costin-Robert Sin <[email protected]>

Author: costinsin

src/unistd.rs

@@ -608,7 +608,7 @@ fn reserve_double_buffer_size<T>(buf: &mut Vec<T>, limit: usize) -> Result<()> {
     use std::cmp::min;
 
     if buf.capacity() >= limit {
-        return Err(Errno::ERANGE)
+        return Err(Errno::ERANGE);
     }
 
     let capacity = min(buf.capacity() * 2, limit);