Call function from function table. Discovered during static build.

This commit was SVN r29755.

ompi/mca/common/cuda/common_cuda.c

@@ -94,6 +94,7 @@ struct cudaFunctionTable {
 #if OPAL_CUDA_SUPPORT_60
     int (*cuPointerSetAttribute)(const void *, CUpointer_attribute, CUdeviceptr);
 #endif /* OPAL_CUDA_SUPPORT_60 */
+    int (*cuCtxSetCurrent)(CUcontext);
 } cudaFunctionTable;
 typedef struct cudaFunctionTable cudaFunctionTable_t;
 cudaFunctionTable_t cuFunc;
@@ -454,6 +455,7 @@ int mca_common_cuda_stage_one_init(void)
 #if OPAL_CUDA_SUPPORT_60
     OMPI_CUDA_DLSYM(libcuda_handle, cuPointerSetAttribute);
 #endif /* OPAL_CUDA_SUPPORT_60 */
+    OMPI_CUDA_DLSYM(libcuda_handle, cuCtxSetCurrent);
     return 0;
 }
 
@@ -1537,7 +1539,7 @@ static int mca_common_cuda_is_gpu_buffer(const void *pUserBuf)
                             "res=%d, ptr=%p aborting...", res, pUserBuf);
                 ompi_rte_abort(1, NULL);
             } else {
-                res = cuCtxSetCurrent(ctx);
+                res = cuFunc.cuCtxSetCurrent(ctx);
                 if (res != CUDA_SUCCESS) {
                     opal_output(0, "CUDA: error calling cuCtxSetCurrent: "
                                 "res=%d, ptr=%p aborting...", res, pUserBuf);