Update src/stdlib_str2num.f90

Co-authored-by: Jeremie Vandenplas <[email protected]>

Author: jalvesz

src/stdlib_str2num.f90

@@ -406,8 +406,8 @@ subroutine to_real_qp(s,v,p,stat)
         ! -- In/out Variables
         character(*), intent(in) :: s !> input string
         real(wp), intent(inout)  :: v !> Output real value
-        integer(1), intent(out)  :: p !> last position within the string
-        integer(1), intent(out)  :: stat !> status upon success or failure to read
+        integer(int8), intent(out)  :: p !> last position within the string
+        integer(int8), intent(out)  :: stat !> status upon success or failure to read
 
         ! -- Internal Variables
         integer(kind=ikind), parameter :: nwnb = 50 !> number of whole number factors