Remove redundant check for triu/l_kernels

theano/gpuarray/magma_cholesky.c

@@ -9,12 +9,10 @@ KERNEL void tril_kernel(const ga_size nthreads, const ga_size ncols,
        index += LDIM_0 * GDIM_0) {
     unsigned int ix = index / ncols;
     unsigned int iy = index % ncols;
-    if (index < nthreads) {
     if (ix < iy) {
       a[index] = 0.0;
     }
   }
-  }
 }
 
 #kernel triu_kernel : size, size, *:
@@ -26,12 +24,10 @@ KERNEL void triu_kernel(const ga_size nthreads, const ga_size ncols,
        index += LDIM_0 * GDIM_0) {
     unsigned int ix = index / ncols;
     unsigned int iy = index % ncols;
-    if (index < nthreads) {
     if (ix > iy) {
       a[index] = 0.0;
     }
   }
-  }
 }
 
 #section init_code