removed a whitespace

Author: degawa

src/stdlib_io_npy_load.fypp

@@ -138,7 +138,7 @@ contains
                 &      + ichar(buf(3)) * 256**2 &
                 &      + ichar(buf(4)) * 256**3
         else
-            header_len = ichar(buf(1))  &
+            header_len = ichar(buf(1)) &
                 &      + ichar(buf(2)) * 256**1
         end if
         allocate(character(header_len) :: dict, stat=stat)