rpc : fix ggml_backend_rpc_supports_buft() (#7918) #4

Job	Run time
Push Docker image to Docker Hub (light, .devops/llama-cli.Dockerfile, linux/amd64,linux/arm64)	11m 18s
Push Docker image to Docker Hub (server, .devops/llama-server.Dockerfile, linux/amd64,linux/arm64)	12m 56s
Push Docker image to Docker Hub (full, .devops/full.Dockerfile, linux/amd64,linux/arm64)	33m 47s
Push Docker image to Docker Hub (light-cuda, .devops/llama-cli-cuda.Dockerfile, linux/amd64)	46m 37s
Push Docker image to Docker Hub (server-cuda, .devops/llama-server-cuda.Dockerfile, linux/amd64)	25m 21s
Push Docker image to Docker Hub (full-cuda, .devops/full-cuda.Dockerfile, linux/amd64)	1h 7m 53s
Push Docker image to Docker Hub (light-rocm, .devops/llama-cli-rocm.Dockerfile, linux/amd64,linux...	32m 7s
Push Docker image to Docker Hub (server-rocm, .devops/llama-server-rocm.Dockerfile, linux/amd64,l...	31m 4s
Push Docker image to Docker Hub (full-rocm, .devops/full-rocm.Dockerfile, linux/amd64,linux/arm64)	33m 29s
Push Docker image to Docker Hub (light-intel, .devops/llama-cli-intel.Dockerfile, linux/amd64)	11m 39s
Push Docker image to Docker Hub (server-intel, .devops/llama-server-intel.Dockerfile, linux/amd64)	12m 24s
	5h 18m 35s

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