Fix code style mismatch.

libretro-common/string/stdstring.c

@@ -87,7 +87,7 @@ char *string_replace_substring(const char *in, const char *pattern, const char *
    }
    
    outlen = strlen(in) - pattern_len*numhits + replacement_len*numhits;
-	out = malloc(outlen+1);
+   out    = (char *)malloc(outlen+1);
    outat  = out;
    
    inat   = in;