recovery: Fix potential dprintf issue
recovery: Fix potential dprintf issue

Terminate recovery message command string before actually printing it

Change-Id: Iea5e7dd27a88e65f2cf5ac9a87c29a0f85b55260

chirayudesai/android_bootable_bootloader_lk,Foxda-Tech/polaris-bootable-bootloader-lk,t2m-foxfone/android_kernel_lk,t2m-foxfone/android_kernel_lk,jsr-d10/android_bootable_bootloader_lk,efidroid/lk,CanarySolutions/little-kernel,Redmi-dev/android_bootable_lk,CanarySolutions/little-kernel,M1cha/android_bootable_bootloader_lk,chirayudesai/android_bootable_bootloader_lk,detule/lk-g2-spr,chirayudesai/android_bootable_bootloader_lk,lg-devs/g2-bootloader,mozilla-b2g/fairphone2_kernel_lk,mozilla-b2g/kernel_lk,t2m-foxfone/kernel_lk,idor/dk50-bootable_bootloader_lk,M1cha/android_bootable_bootloader_lk,efidroid/lk,chirayudesai/android_bootable_bootloader_lk,t2m-foxfone/android_kernel_lk,mozilla-b2g/kernel_lk,Foxda-Tech/argo8-bootable-bootloader-lk,chirayudesai/android_bootable_bootloader_lk,mozilla-b2g/fairphone2_kernel_lk,M1cha/lktris,lg-devs/g2-bootloader,jbott/lk_gee,idor/dk50-bootable_bootloader_lk,lg-devs/g2-bootloader,lg-devs/g2-bootloader,M1cha/android_bootable_bootloader_lk,t2m-foxfone/kernel_lk,t2m-foxfone/kernel_lk,detule/lk-g2-spr,efidroid/lk,mozilla-b2g/kernel_lk,CanarySolutions/little-kernel,M1cha/android_bootable_bootloader_lk,M1cha/lktris,M1cha/lktris,Foxda-Tech/argo8-bootable-bootloader-lk,jbott/lk_gee,jbott/lk_gee,CanarySolutions/little-kernel,jbott/lk_gee,Foxda-Tech/argo8-bootable-bootloader-lk,mozilla-b2g/fairphone2_kernel_lk,lg-devs/g2-bootloader,detule/lk-g2-spr,Foxda-Tech/argo8-bootable-bootloader-lk,Foxda-Tech/polaris-bootable-bootloader-lk,jsr-d10/android_bootable_bootloader_lk,Foxda-Tech/polaris-bootable-bootloader-lk,idor/dk50-bootable_bootloader_lk,Redmi-dev/android_bootable_lk,jsr-d10/android_bootable_bootloader_lk,M1cha/android_bootable_bootloader_lk,Redmi-dev/android_bootable_lk,Foxda-Tech/polaris-bootable-bootloader-lk,Redmi-dev/android_bootable_lk,CanarySolutions/little-kernel,mozilla-b2g/kernel_lk,detule/lk-g2-spr,t2m-foxfone/android_kernel_lk,M1cha/lktris,jbott/lk_gee,efidroid/lk,Foxda-Tech/polaris-bootable-bootloader-lk,idor/dk50-bootable_bootloader_lk,mozilla-b2g/fairphone2_kernel_lk,jsr-d10/android_bootable_bootloader_lk,Redmi-dev/android_bootable_lk,mozilla-b2g/fairphone2_kernel_lk,M1cha/android_bootable_bootloader_lk,mozilla-b2g/kernel_lk,detule/lk-g2-spr,idor/dk50-bootable_bootloader_lk,M1cha/lktris,Foxda-Tech/argo8-bootable-bootloader-lk,t2m-foxfone/android_kernel_lk,efidroid/lk,t2m-foxfone/kernel_lk,jsr-d10/android_bootable_bootloader_lk,t2m-foxfone/kernel_lk