math_brute_force: skip all enqueues in -l mode (#1993)

The math_brute_force test has a link-check-only mode to quickly test if
all math functions are present.

In link-check-only mode, most tests return immediately after kernel
compilation, but some tests also run the kernel and read back the result
data before returning. Running the kernels takes a lot more time,
defeating the purpose of the `-l` mode.

Break out at the start of the main `for` loops in link-check-only mode
instead of returning directly, so that each test can still log its
trailing message (in most cases just a `\n`).

Signed-off-by: Sven van Haastregt <sven.vanhaastregt@arm.com>

test_conformance/math_brute_force/mad_float.cpp

@@ -62,6 +62,8 @@ int TestFunc_mad_Float(const Func *f, MTdata d, bool relaxedMode)
 
     for (uint64_t i = 0; i < (1ULL << 32); i += step)
     {
+        if (gSkipCorrectnessTesting) break;
+
         // Init input array
         cl_uint *p = (cl_uint *)gIn;
         cl_uint *p2 = (cl_uint *)gIn2;
@@ -187,8 +189,6 @@ int TestFunc_mad_Float(const Func *f, MTdata d, bool relaxedMode)
             }
         }
 
-        if (gSkipCorrectnessTesting) break;
-
         // Verify data -- No verification possible.
         // MAD is a random number generator.
         if (0 == (i & 0x0fffffff))