target-mips: fix memory leak

Coveristy reports that variable prom_buf/params_buf going
out of scope leaks the storage it points to.

Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: Leon Alrae <leon.alrae@imgtec.com>
Signed-off-by: Gonglei <arei.gonglei@huawei.com>
Reviewed-by: Leon Alrae <leon.alrae@imgtec.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

hw/mips/mips_fulong2e.c

@@ -168,6 +168,7 @@ static int64_t load_kernel (CPUMIPSState *env)
     rom_add_blob_fixed("prom", prom_buf, prom_size,
                        cpu_mips_kseg0_to_phys(NULL, ENVP_ADDR));
 
+    g_free(prom_buf);
     return kernel_entry;
 }
 

hw/mips/mips_malta.c

@@ -861,6 +861,7 @@ static int64_t load_kernel (void)
     rom_add_blob_fixed("prom", prom_buf, prom_size,
                        cpu_mips_kseg0_to_phys(NULL, ENVP_ADDR));
 
+    g_free(prom_buf);
     return kernel_entry;
 }
 

hw/mips/mips_r4k.c

@@ -139,6 +139,7 @@ static int64_t load_kernel(void)
     rom_add_blob_fixed("params", params_buf, params_size,
                        (16 << 20) - 264);
 
+    g_free(params_buf);
     return entry;
 }