Examples: Correct arguments to perror

examples/C/grib_clone.c

@@ -68,7 +68,7 @@ int main(int argc, char* argv[])
         CODES_CHECK(codes_get_message(clone_handle, &buffer, &size), 0);
         /* write the buffer to a file */
         if (fwrite(buffer, 1, size, out) != size) {
-            perror(argv[1]);
+            perror(argv[2]);
             return 1;
         }
         codes_handle_delete(clone_handle);

examples/C/grib_precision.c

@@ -116,7 +116,7 @@ int main(int argc, char** argv)
 
     /* write the buffer in a file*/
     if (fwrite(buffer, 1, size, out) != size) {
-        perror(argv[1]);
+        perror(outfile);
         exit(1);
     }
 

examples/C/grib_set_keys.c

@@ -78,7 +78,7 @@ int main(int argc, char** argv)
 
     /* write the buffer in a file*/
     if (fwrite(buffer, 1, size, out) != size) {
-        perror(argv[1]);
+        perror(outfile);
         exit(1);
     }
 

examples/C/grib_set_missing.c

@@ -77,7 +77,7 @@ int main(int argc, char** argv)
 
     /* write the buffer in a file*/
     if (fwrite(buffer, 1, size, out) != size) {
-        perror(argv[1]);
+        perror(outfile);
         exit(1);
     }
 

examples/C/grib_set_pv.c

@@ -78,7 +78,7 @@ int main(int argc, char** argv)
 
     /* write the buffer in a file*/
     if (fwrite(buffer, 1, size, out) != size) {
-        perror(argv[1]);
+        perror(outfile);
         exit(1);
     }