tests: Fix specifying constant of double type

'd' suffix seems to be not acceptable by clang compiler
Using 'e0' fixes this by keeping value to be same

Fixes
funcretval_test_struct.c:83:27: error: invalid suffix 'd' on floating constant
   83 |   dpoint_t dp = dmkpt (3.0d, 1.0d);
      |                           ^
funcretval_test_struct.c:83:33: error: invalid suffix 'd' on floating constant
   83 |   dpoint_t dp = dmkpt (3.0d, 1.0d);
      |

Signed-off-by: Khem Raj <raj.khem@gmail.com>
1 file changed