eal/windows: fix C++ compatibility

[ upstream commit 56446c9 ]

Explicitly cast void * to type * so that EAL headers may be compiled
as C or C++.

Fixes: e8428a9 ("eal/windows: add some basic functions and macros")

Signed-off-by: Tyler Retzlaff <roretzla@linux.microsoft.com>

lib/librte_eal/windows/include/rte_os.h

@@ -86,7 +86,7 @@ asprintf(char **buffer, const char *format, ...)
 		return -1;
 	size++;
 
-	*buffer = malloc(size);
+	*buffer = (char *)malloc(size);
 	if (*buffer == NULL)
 		return -1;