Remove the variable ret due to compiler warning:

Janne Kiiskilä · Janne Kiiskilä · commit 258bcab61833 · 2016-11-02T11:29:20.000+02:00
Compile [ 94.6%]: trng_api.c [Warning] trng_api.c@67,9: unused variable 'ret' [-Wunused-variable] Github issue #3183
diff --git a/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_MCU_K64F/trng_api.c b/targets/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_MCU_K64F/trng_api.c
@@ -64,7 +64,6 @@ int trng_get_bytes(trng_t *obj, uint8_t *output, size_t length, size_t *output_l
 {
     (void)obj;
     size_t i;
-    int ret;
 
     /* Set "Interrupt Mask", "High Assurance" and "Go",
      * unset "Clear interrupt" and "Sleep" */

Original file line number	Diff line number	Diff line change
`@@ -64,7 +64,6 @@ int trng_get_bytes(trng_t obj, uint8_t output, size_t length, size_t *output_l`
`64`	`64`	`{`
`65`	`65`	`(void)obj;`
`66`	`66`	`size_t i;`
`67`		`- int ret;`
`68`	`67`
`69`	`68`	`/* Set "Interrupt Mask", "High Assurance" and "Go",`
`70`	`69`	`* unset "Clear interrupt" and "Sleep" */`