Ensure consistent indentation

[Beliavsky]

In stdlib_linalg_lapack_s.f90 in stdlib_slartg there is an else if that is not indented consistently with the rest of the block. It's a minor thing, but ultimately there should be an auto-formatting step that ensures consistent indentation.

     pure subroutine stdlib_slartg(f,g,c,s,r)
        ! -- lapack auxiliary routine --
        ! -- lapack is a software package provided by univ. of tennessee,    --
        ! -- univ. of california berkeley, univ. of colorado denver and nag ltd..--
           ! february 2021
        ! Scalar Arguments
        real(sp),intent(out) :: c,r,s
        real(sp),intent(in) :: f,g
        ! Local Scalars
        real(sp) :: d,f1,fs,g1,gs,p,u,uu
        ! Intrinsic Functions
        intrinsic :: abs,sign,sqrt
        ! Executable Statements
        f1 = abs(f)
        g1 = abs(g)
        if (g == zero) then
           c = one
           s = zero
           r = f
        else if (f == zero) then
           c = zero
           s = sign(one,g)
           r = g1
     else if (f1 > rtmin .and. f1 < rtmax .and. g1 > rtmin .and. g1 < rtmax) &
               then
           d = sqrt(f*f + g*g)
           p = one/d
           c = f1*p
           s = g*sign(p,f)
           r = sign(d,f)
        else
           u = min(safmax,max(safmin,f1,g1))
           uu = one/u
           fs = f*uu
           gs = g*uu
           d = sqrt(fs*fs + gs*gs)
           p = one/d
           c = abs(fs)*p
           s = gs*sign(p,f)
           r = sign(d,f)*u
        end if
        return
     end subroutine stdlib_slartg