Fix compiler warnings when QUDA_INVERFACE_NVTX=ON

Author: maddyscientist

include/timer.h

@@ -195,7 +195,7 @@ namespace quda {
 #define PUSH_RANGE(name,cid) { \
     int color_id = cid; \
     color_id = color_id%nvtx_num_colors;\
-    nvtxEventAttributes_t eventAttrib = {0}; \
+    nvtxEventAttributes_t eventAttrib = {}; \
     eventAttrib.version = NVTX_VERSION; \
     eventAttrib.size = NVTX_EVENT_ATTRIB_STRUCT_SIZE; \
     eventAttrib.colorType = NVTX_COLOR_ARGB; \

lib/milc_interface.cpp

@@ -33,7 +33,7 @@ static const int num_colors = sizeof(colors)/sizeof(uint32_t);
 #define PUSH_RANGE(name,cid) { \
   int color_id = cid; \
   color_id = color_id%num_colors;\
-  nvtxEventAttributes_t eventAttrib = {0}; \
+  nvtxEventAttributes_t eventAttrib = {}; \
   eventAttrib.version = NVTX_VERSION; \
   eventAttrib.size = NVTX_EVENT_ATTRIB_STRUCT_SIZE; \
   eventAttrib.colorType = NVTX_COLOR_ARGB; \