Fix fuzzing detected crash

src/core/lib/surface/call.c

...pi_fuzzer_corpus/0a4b84c2a50ba66f06c99e945912972cdcfc96be

...pi_fuzzer_corpus/22c7bfb3460529c77255e9cb82ef8f7d8381f8f3

...pi_fuzzer_corpus/33f0e1b78dd158df720604cbb4c9a0c90eece435

...pi_fuzzer_corpus/3cac506501825fadf2e4adf7619d16f72cfd8832

...pi_fuzzer_corpus/87a34188d51bc8b43bd7d9097958097e70154960

...pi_fuzzer_corpus/939a61533db8868591c514fc41c7dfb4232e3e4f

...pi_fuzzer_corpus/98a661d328f1ad6277c802604126d91965d6fda8

...pi_fuzzer_corpus/9c052499ada417d5038f8cc7da62e6acae9ba9ae

...pi_fuzzer_corpus/a881a2dcd16f595644c1543ccf047b7ae5bb7fa4

...pi_fuzzer_corpus/b09e64aa807db006a219bd1b9faf1a2e00dc6d33

...zer_corpus/crash-b208a1eb5ef9f229f309492329323f485768fa74

...pi_fuzzer_corpus/e52ac2e3cad2e544488a01822115cb37d10a76ce

tools/run_tests/generated/tests.json