hw/mips/r4k: Constify params_size

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20180625124238.25339-30-f4bug@amsat.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

hw/mips/mips_r4k.c

@@ -79,8 +79,9 @@ typedef struct ResetData {
 
 static int64_t load_kernel(void)
 {
+    const size_t params_size = 264;
     int64_t entry, kernel_high;
-    long kernel_size, initrd_size, params_size;
+    long kernel_size, initrd_size;
     ram_addr_t initrd_offset;
     uint32_t *params_buf;
     int big_endian;
@@ -128,7 +129,6 @@ static int64_t load_kernel(void)
     }
 
     /* Store command line.  */
-    params_size = 264;
     params_buf = g_malloc(params_size);
 
     params_buf[0] = tswap32(ram_size);
@@ -143,7 +143,7 @@ static int64_t load_kernel(void)
     }
 
     rom_add_blob_fixed("params", params_buf, params_size,
-                       (16 << 20) - 264);
+                       (16 << 20) - params_size);
 
     g_free(params_buf);
     return entry;