Fix a couple of memory bugs

src/cell.c

@@ -350,7 +350,6 @@ int cell_get_reciprocal(UnitCell *cell,
 	gsl_matrix_set(m, 2, 1, cell->bz);
 	gsl_matrix_set(m, 2, 2, cell->cz);
 
-	/* Invert */
 	/* Invert */
 	perm = gsl_permutation_alloc(m->size1);
 	if ( perm == NULL ) {
@@ -381,6 +380,8 @@ int cell_get_reciprocal(UnitCell *cell,
 		free(cell);
 		return -1;
 	}
+	gsl_permutation_free(perm);
+	gsl_matrix_free(m);
 
 	/* Transpose */
 	gsl_matrix_transpose(inv);

src/indexamajig.c

@@ -327,9 +327,6 @@ static void *process_image(void *pargsv)
 	/* Only free cell if found */
 	free(image.indexed_cell);
 
-	/* Free detector panel records */
-	free(image.det.panels);
-
 done:
 	free(image.data);
 	free(image.det.panels);
@@ -477,7 +474,7 @@ int main(int argc, char *argv[])
 	}
 
 	if ( prefix == NULL ) {
-		prefix = "";
+		prefix = strdup("");
 	}
 
 	if ( nthreads == 0 ) {