[Bug-gsl] seg fault from gsl_sf_legendre_sphPlm_e

[Kevin M. Huffenberger]

In the following bit of code, the first call works, but the second call 
dies.

#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <gsl/gsl_sf_legendre.h>

int main() {
  gsl_sf_result y;
  gsl_sf_legendre_sphPlm_e(140,135,1,&y);
  gsl_sf_legendre_sphPlm_e(140,135,0.99998689456491752,&y);
  return(0);
}

The stack backtrace is:

(gdb) backtrace
#0  0x42049bbf in buffered_vfprintf () from /lib/tls/libc.so.6
#1  0x4204957f in vfprintf () from /lib/tls/libc.so.6
#2  0x4204f39f in fprintf () from /lib/tls/libc.so.6
#3  0x4008ec8c in gsl_stream_printf (label=0x40183452 "ERROR",
    file=0x40195557 "exp.c", line=541, reason=0x4019554d "underflow")
    at stream.c:44
#4  0x4008eb7f in gsl_error (reason=0x4019554d "underflow",
    file=0x40195557 "exp.c", line=541, gsl_errno=15) at error.c:41
#5  0x4013979d in gsl_sf_exp_err_e (x=-711.14097209630847,
    dx=1.7459778940285803e-13, result=0xbffff6c8) at exp.c:541
#6  0x40158831 in gsl_sf_legendre_sphPlm_e (l=140, m=135,
    x=0.99998689456491752, result=0xbffff730) at legendre_poly.c:531
#7  0x0804850c in main ()
#8  0x420156a4 in __libc_start_main () from /lib/tls/libc.so.6


---Kevin