tests/test_grib.c: added declaration for memset

tests/test_grib.c

 #include <stdio.h>
 #include <stdlib.h>
-
+#include <string.h>
 
 #include "cdi.h"
 
@@ -25,7 +25,7 @@ int main(int argc, char *argv[])
   int vlistID, taxisID;
   int nmiss;
 
-  
+
   datasize = nlon * nlat;
   data = (double *) malloc(datasize*sizeof(double));
   memset(data, 0, datasize*sizeof(double));
@@ -126,12 +126,3 @@ int main(int argc, char *argv[])
 
   return (0);
 }
-/*
- * Local Variables:
- * c-file-style: "Java"
- * c-basic-offset: 2
- * indent-tabs-mode: nil
- * show-trailing-whitespace: t
- * require-trailing-newline: t
- * End:
- */