gpu-compute: Fix scalar register ready check

Replaces some curly braces that were accidentally removed
causing the function to return false even when it shouldn't

Change-Id: I15fb4167468c8e3dd1107f1ca3dc98c48df4611b
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/44045
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com>
Reviewed-by: Alex Dutu <alexandru.dutu@amd.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Matt Sinclair <mattdsinclair@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/gpu-compute/scalar_register_file.cc

@@ -52,11 +52,12 @@ ScalarRegisterFile::operandsReady(Wavefront *w, GPUDynInstPtr ii) const
 {
     for (const auto& srcScalarOp : ii->srcScalarRegOperands()) {
         for (const auto& physIdx : srcScalarOp.physIndices()) {
-            if (regBusy(physIdx))
+            if (regBusy(physIdx)) {
                 DPRINTF(GPUSRF, "RAW stall: WV[%d]: %s: physReg[%d]\n",
                         w->wfDynId, ii->disassemble(), physIdx);
                 w->stats.numTimesBlockedDueRAWDependencies++;
                 return false;
+            }
         }
     }