Unit tests: fix number of GPU detection (#484)

[ROCm/rccl commit: 6268b87c16]

projects/rccl/test/CMakeLists.txt

@@ -69,7 +69,7 @@ if(BUILD_TESTS)
 
   find_program( rocminfo_executable rocminfo )
   execute_process(COMMAND bash "-c" "${rocminfo_executable} | grep 'Device Type' | grep GPU | wc -l | tr -d '\n'" OUTPUT_VARIABLE gtest_num_gpus)
-  if(${gtest_num_gpus} MATCHES "0" OR ${gtest_num_gpus} MATCHES "1")
+  if(${gtest_num_gpus} EQUAL "0" OR ${gtest_num_gpus} EQUAL "1")
     set(gtest_num_gpus "2")
   endif()
   target_compile_options(UnitTests PRIVATE -DGTESTS_NUM_GPUS=${gtest_num_gpus})