Fix Clang -Wself-assign warnings

Author: seanm

libdispatch/ncproplist.c

@@ -392,5 +392,5 @@ ncproplist_unused(void)
     unused = ncproplistith;
     unused = ncproplistinit;
     unused = (void*)ncproplistith;
-    unused = unused;
+    (void)unused;
 }

libnczarr/zplugins.c

@@ -763,8 +763,8 @@ printhdf5(const NCZ_HDF5 h)
 static void static_unused(void)
 {
     void* p = NULL;
-    (void)p;
     p = static_unused;
+    (void)p;
 #if defined(DEBUGF) || defined(DEBUGL)
 (void)printplugin(NULL);
 (void)printparams(0, NULL);

ncdap_test/findtestserver.c.in

@@ -50,9 +50,6 @@ main(int argc, char** argv)
     char* serverlist = NULL;
     enum KIND kind = NOKIND;
 
-    kind = kind;
-    proto = proto;
-
     argc--; argv++;
     if(argc < 2)
 	usage();
@@ -74,6 +71,9 @@ main(int argc, char** argv)
 	kind = DAP4KIND;
     else
 #endif
+    (void)kind;
+    (void)proto;
+
 	usage();
 
     if(serverlist == NULL) {