coap-client: Rename client.c to coap-client.c

Keep the examples source names and executables in the same form
for consistency.

CMakeLists.txt

@@ -537,7 +537,7 @@ endif()
 #
 
 if(ENABLE_EXAMPLES)
-  add_executable(coap-client ${CMAKE_CURRENT_LIST_DIR}/examples/client.c)
+  add_executable(coap-client ${CMAKE_CURRENT_LIST_DIR}/examples/coap-client.c)
   target_link_libraries(coap-client PUBLIC ${PROJECT_NAME}::${COAP_LIBRARY_NAME})
 
   add_executable(coap-rd ${CMAKE_CURRENT_LIST_DIR}/examples/coap-rd.c)

examples/Makefile.am

@@ -17,7 +17,7 @@ AM_CFLAGS = -I$(top_builddir)/include -I$(top_srcdir)/include \
 bin_PROGRAMS = coap-client coap-server coap-rd
 check_PROGRAMS = coap-etsi_iot_01 coap-tiny
 
-coap_client_SOURCES = client.c
+coap_client_SOURCES = coap-client.c
 coap_client_LDADD =  $(DTLS_LIBS) $(top_builddir)/.libs/libcoap-$(LIBCOAP_NAME_SUFFIX).la
 
 coap_server_SOURCES = coap-server.c