config: rename get_config_entry -> config_entry

We're already in the git_config namespace, there is no need to repeat
it.

include/git2/config.h

@@ -274,7 +274,7 @@ GIT_EXTERN(void) git_config_free(git_config *cfg);
  * @param name the variable's name
  * @return 0 or an error code
  */
-GIT_EXTERN(int) git_config_get_config_entry(const git_config_entry **out, git_config *cfg, const char *name);
+GIT_EXTERN(int) git_config_get_entry(const git_config_entry **out, git_config *cfg, const char *name);
 
 /**
  * Get the value of an integer config variable.

src/config.c

@@ -435,7 +435,7 @@ int git_config_get_string(const char **out, git_config *cfg, const char *name)
 	return GIT_ENOTFOUND;
 }
 
-int git_config_get_config_entry(const git_config_entry **out, git_config *cfg, const char *name)
+int git_config_get_entry(const git_config_entry **out, git_config *cfg, const char *name)
 {
 	file_internal *internal;
 	unsigned int i;

tests-clar/config/read.c

@@ -305,7 +305,7 @@ void test_config_read__read_git_config_entry(void)
 	cl_git_pass(git_config_add_file_ondisk(cfg, cl_fixture("config/config9"),
 		GIT_CONFIG_LEVEL_SYSTEM, 0));
 
-	cl_git_pass(git_config_get_config_entry(&entry, cfg, "core.dummy2"));
+	cl_git_pass(git_config_get_entry(&entry, cfg, "core.dummy2"));
 	cl_assert_equal_s("core.dummy2", entry->name);
 	cl_assert_equal_s("42", entry->value);
 	cl_assert_equal_i(GIT_CONFIG_LEVEL_SYSTEM, entry->level);